Perhaps you should try some spelling variations:
optical astronomy » spherical astronomy, positional astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
astronomy sergey » astronomy survey, astronomy seven, astronomy large
board nautical » board practical, board national, board neutral
some nautical » some analytical, some practical, some critical
patrick board » patrick bond, patrick hubbard, patrick leonard
patrick core » patrick corr, patrick moore, patrick corsi
core optical » mode optical, large 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 core optical astronomy sergey ) OR ((( the patrick some nautical astronomy sergey ) OR ( the patrick board nautical astronomy surveys )))).
• Adding a wildcard symbol may retrieve word variants: (( the patrick core optical astronomy sergey ) or ((( the patrick some nautical astronomy sergey ) or ( the patrick board nautical astronomy surveys ))))*.