Perhaps you should try some spelling variations:
some propositional » some propositions, from propositional, form propositional
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
some position » some positions, home position, same position

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

• If you are trying to use Boolean operators, they must be ALL CAPS: the trick ((some propositional) OR (some position)) astronomy survives*.