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

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "the ((patrick does) OR (patrick del)) practical astronomy surveys*".