> For the complete documentation index, see [llms.txt](https://help.reletter.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.reletter.com/how-to-search-for-issues.md).

# How to search for newsletter issues

Reletter's [issues search](https://reletter.com/search/issues/real%20estate%20-investing) makes it easy to find newsletter issues for the topic or niche that you care about. This guide explains how to use the search engine and gives you some tips and best practices.

## Search for issues

Go to the [Home](https://reletter.com/home) screen and choose the **Issues** tab above the search bar.

![](/files/XyjbVOmNAq1cYglwjgMK)

Enter a search query (eg. real estate investing or marketing) and hit enter to see the most relevant issues for your search term.

![](/files/m6ZMK8dLwI2ijR0zmMR8)

## Advanced filters

Advanced search filters let you slice-and-dice millions of newsletter issues in all kinds of new ways to find the ones you're looking for.

For example: show me the most recent issues about "real estate" (excluding the keyword "investing") from Substack newsletters with more than 5,000 subscribers.

![](/files/sZSxtP5kRSPxRmM2YXQe)

## Search operators

You use the following search operators to narrow down your results:

<table data-header-hidden><thead><tr><th width="262.45619531338286">Description</th><th>Example</th></tr></thead><tbody><tr><td>Description</td><td>Example</td></tr><tr><td>Either terms can match</td><td><code>real OR estate</code></td></tr><tr><td>Both terms must match</td><td><code>real AND estate</code></td></tr><tr><td>Exact phrase</td><td><code>"real estate"</code></td></tr><tr><td>Don't match</td><td><code>-investing</code></td></tr><tr><td>Grouping</td><td><code>(real estate) OR (property investing)</code></td></tr></tbody></table>


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# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://help.reletter.com/how-to-search-for-issues.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.