You can search for specific text in all your notes, notes in a specific account, or in a single note. Your search finds matching text in the body of notes and in the file names of attachments. Your search also finds matching text in text files (such as Pages documents and PDFs) that you’ve attached to your notes. If you’ve locked a note, only the title text appears in the results.
Tip: If you’re using upgraded iCloud notes or notes stored on your Mac, you can also browse your attachments by clicking the Attachments button 
. For more information, see Attach photos, links, and more.
Search: Enter text in the search field.
Search in a specific account: Click a folder in the account you want to search, click in the search field, click the magnifying glass 
, then choose Current Account.
Search in all accounts: Click in the search field, click the magnifying glass , then choose All Accounts.
Find text in a note: Click the body of a note to add an insertion point, then choose Edit > Find > Find (or press Command-F). Enter text in the search field that appears.
Ask Siri. Say something like:
“Show me notes from today”
“Show me notes about vacation plans”