Perhaps you should try some spelling variations:
astronomy series » astronomy sergey, gastronomy services, astronomy survives
moore practical » more practical, mouse practical, course practical
moocs practical » books practical, mics practical, blocks practical

You may be able to get more results by adjusting your search query.

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