Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, positional astronomy
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
mouse practical » course practical, rouses practical, more practical
patrick mouse » patrick moore, patrick mons, patrick cousot
patrick more » patrick moore, patrick moyes, patrick mkie
more optical » moire optical, core optical, more optimal

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