Perhaps you should try some spelling variations:
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moocs practical » books practical, colts practical, coins practical
mics practical » ics practical, micro practical, abcs practical
moore nautical » board nautical, mile nautical, moore national

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 ((moocs practical) OR (mics practical)) astronomy sergey ) OR ( the patrick moore nautical astronomy sergey )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick ((moocs practical) OR (mics practical)) astronomy sergey ) or ( the patrick moore nautical astronomy sergey ))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick ((moocs practical) OR (mics practical)) astronomy sergey ) or ( the patrick moore nautical astronomy sergey ))*.