Errors using Search in notes

Hi viresh97, and welcome to the Apple (user-to-user) community!

Wondering what happens when you search, and whether Apple support's tips below are of any help to you.

Eg:

" You can search for

tags,

typed and handwritten text (in supported languages),

objects that appear in images,

and text in scanned documents.

Note: If a note is locked, only its title appears in the search results.

1. Swipe down on the notes list to reveal the search field.
2. Tap the search field, then enter what you’re looking for.

You can also choose a suggested search, such as “Notes with Drawings,”

then enter additional text to refine your search.

The search includes handwritten text (in supported languages), photos, and scanned documents."

Above is from Apple support's complete article: Search your notes on iPad - Apple Support

All the best :-)