Mathcad Prime 8.0 - Search bar is not working for variable name including sub script

Hi everyone

Does anyone know how to use the search bar to find a variable including sub script? I experience the following:

1. Search for variable excluding subscript - works
2. Search for text in subscript - works
3. Search for text in variable including subscript (i.e. copy math and paste into search bar) - does not work

Besides, it also does not seem to search in collapsed areas, or have I overlooked something?

Thanks.