Perhaps you should try some spelling variations:
improved microscope » probe microscope
reference python » reference method, reference author, reference edition
program improved » programs improved, program improve, program improving
microscope https » microscopy https, microscope hans, microscope its
python program » python programs, action program, python programming

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: reference python program improved microscope https~.
• Adding a wildcard symbol may retrieve word variants: reference python program improved microscope https*.