Perhaps you should try some spelling variations:
astronomy series » gastronomy services, astronomy survives, astronomy studies
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moore practical » moocs practical, mouse practical, course practical
more practical » some practical

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