An error occurred while saving the commentHarpreet Singh commented
Until now, I didn't know this is a problem while searching inside equation. But following steps may fulfill the need.
1. Alt + + to open a built-in equation.
2. Type whatever symbol / letter / character you want to type.
3. Select and copy the symbol or character you want.
4. To open a search dialog, press ctrl+f (write after selection).
5. This will highlight wherever selection occurs.
I've managed to follow, hopefully it will help the new seekers.