Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, positional astronomy
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy during » astronomy dialling, astronomy meeting, economy during
drops practical » aris practical, devops practices, arrays practical
patrick drops » patrick debois, patrick dr, patrick brown
patrick mons » patrick moyes, patrick bond, patrick mpondo
mons optical » ions optical, mono optical, cmos optical

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 survives ) OR ( the patrick mons optical astronomy during )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick drops practical astronomy survives ) or ( the patrick mons optical astronomy during ))*.