Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
patrick drew » patrick andrew, patrick dr, patrick de
patrick del » patrick de, patrick dobel, patrick dale

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 ((patrick drew) OR (patrick del)) practical astronomy surveys*.