The search bar only shows common search terms that people use. You can search your notes using the "notes" keyword and any annotations by using the "highlighted_text" keyword. To search for multiple tags simply add the AND keyword. So if you have a tag for Elephant and a tag for Shark you can use the following query:
tag:Elephant AND tag:Shark
To see all you can do with search we highly recommend reading the following knowledge base article: Advanced Searching Syntax
The main search bar should have options to search within notes/annotations.
The advanced search should also the ability to filter by a particular tag (or multiple tags) that the user selects.
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