Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy studies » astronomy study, economy studies, astronomy status
drops practical » aris practical, devops practices, arrays practical
patrick drops » patrick debois, patrick dr, patrick brown
patrick mons » patrick moyes, patrick mpondo, patrick timony
patrick bond » patrick d, patrick b, patrick d.d

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 drops practical astronomy studies ) OR ( the ((patrick mons) OR (patrick bond)) spherical astronomy meeting )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick drops practical astronomy studies ) or ( the ((patrick mons) OR (patrick bond)) spherical astronomy meeting ))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick drops practical astronomy studies ) or ( the ((patrick mons) OR (patrick bond)) spherical astronomy meeting ))*.