Perhaps you should try some spelling variations:
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
patrick moyes » patrick keyes, patrick mayen, patrick moore's
patrick mons » patrick bond, patrick mpondo, patrick timony

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 moyes) OR (patrick mons)) optical astronomy sergey.
• Adding a wildcard symbol may retrieve word variants: the ((patrick moyes) or (patrick mons)) optical astronomy sergey*.