Perhaps you should try some spelling variations:
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
moocs practical » books practical, mics practical, colts practical
drops practical » aris practical, devops practices, arrays 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 ((moocs practical) OR (drops practical)) astronomy surveys".
• Adding a wildcard symbol may retrieve word variants: the patrick ((moocs practical) OR (drops practical)) astronomy surveys*.