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
moore practical » more practical, moocs practical, mouse practical
astronomy seven » astronomy some, astronomy science, astronomy between

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