Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
patrick moyes » patrick keyes, patrick mons, patrick moore's
patrick mayen » patrick bayer, patrick madan, patrick maxton

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 moyes) OR (patrick mayen)) practical astronomy sergey".
• Adding a wildcard symbol may retrieve word variants: the ((patrick moyes) OR (patrick mayen)) practical astronomy sergey*.