Perhaps you should try some spelling variations:
astronomy series » astronomy sergey, gastronomy services, astronomy survives
astronomy survey » astronomy surveys, astronomy sergey, autonomy survey
moore practical » more practical, moocs practical, mouse 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 ((astronomy series) OR (astronomy survey)).
• Adding a wildcard symbol may retrieve word variants: the patrick moore practical ((astronomy series) or (astronomy survey))*.