Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
moore's practical » moocs practical, rouse's practical, bowles's practical
astronomy sergey » astronomy survey, astronomy seven, astronomy large
mouse practical » course practical, rouses practical, more practical
patrick mouse » patrick mons, patrick cousot, patrick mkie

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 mouse practical astronomy surveys ) OR ( the patrick moore's practical astronomy sergey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick mouse practical astronomy surveys ) or ( the patrick moore's practical astronomy sergey ))*.