# 布尔检索

可以使用布尔运算符 AND，OR，NOT 进行在线搜索。EndNote 会从上向下组合进行搜索，查找前两个搜索结果，然后结合第三个搜索进行，以此类推...

记住：

* OR 可以扩大搜索结果
* AND 缩小搜索结果
* NOT 缩小搜索结果，排除当前检索词的文献


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# Agent Instructions: 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:

```
GET https://kb.howsci.com/online-databases/online-database-searching/boolean-searches.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.