Perhaps you should try some spelling variations:
optical astronomy » nautical astronomy, spherical astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy large
mkie positional » case positional, game positional, gene positional
astronomy seven » astronomy some, astronomy science, astronomy between
patrick topics » tricky topics
topics optical » optics optical, photonics optical
patrick mkie » patrick mackie, patrick mein, patrick moore

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 topics optical astronomy sergey ) OR ( the patrick mkie positional astronomy seven )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick topics optical astronomy sergey ) or ( the patrick mkie positional astronomy seven ))*.