Perhaps you should try some spelling variations:
astronomy studies » astronomy study, economy studies, astronomy status
astronomy series » gastronomy services, astronomy survives, 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 studies))) 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 studies))) or (astronomy sergey))) or (astronomy seven))".
• Adding a wildcard symbol may retrieve word variants: the patrick moore practical ((((((astronomy series) OR (astronomy studies))) or (astronomy sergey))) or (astronomy seven))*.