Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
mics practical » ics practical, micro practical, moocs practical
patrick mics » patrick mons, patrick michel, patrick maill
nos nautical » logs nautical, hoc nautical, some nautical
patrick nos » patrick nomo, patrick bas, patrick corsi
n nautical » _ nautical, a nautical, 2 nautical
patrick n » patrick _, patrick a, patrick 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 mics practical astronomy sergey ) OR ((( the patrick nos nautical astronomy sergey ) OR ( the patrick n nautical astronomy sergey )))).
• Adding a wildcard symbol may retrieve word variants: (( the patrick mics practical astronomy sergey ) or ((( the patrick nos nautical astronomy sergey ) or ( the patrick n nautical astronomy sergey ))))*.