Perhaps you should try some spelling variations:
structures microscopy » structure microscopy, structure microscopic, structure spectroscopy
introducing python » introducing action, introducing mythtv, introducing person
program structures » program structure, protein structures
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: introducing python program structures microscopy (https OR http)~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "introducing python program structures microscopy (https OR http)".
• Adding a wildcard symbol may retrieve word variants: introducing python program structures microscopy (https OR http)*.