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, use practical
patrick mouse » patrick moore, patrick mons, patrick cousot
patrick more » patrick moore, patrick moyes, patrick mkie
more optical » moire optical, mode optical, core optical
patrick some » patrick home, patrick sole, trick some

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 practical astronomy sergey ) OR ( the patrick more optical astronomy sergey ))) OR ( the patrick some practical astronomy sergey )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick mouse practical astronomy sergey ) or ((((( the patrick more practical astronomy sergey ) OR ( the patrick more optical astronomy sergey ))) or ( the patrick some practical astronomy sergey ))))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick mouse practical astronomy sergey ) or ((((( the patrick more practical astronomy sergey ) OR ( the patrick more optical astronomy sergey ))) or ( the patrick some practical astronomy sergey ))))*.