Perhaps you should try some spelling variations:
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
astronomy series » gastronomy services, astronomy studies, astronomy surveys
astronomy sergey » astronomy survey, astronomy surveys, astronomy large
moocs practical » mics practical, does practical, drops practical
astronomy seven » astronomy some, astronomy science, astronomy between
patrick moocs » patrick moore, patrick mons, patrick moyes

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 ((((astronomy series) OR (astronomy survives))) OR (((astronomy sergey) OR (astronomy seven)))).
• Adding a wildcard symbol may retrieve word variants: the patrick moocs practical ((((astronomy series) or (astronomy survives))) or (((astronomy sergey) or (astronomy seven))))*.