Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
moyes practical » modes practical, movies practical, moraes practical
del positional » d positional, cells positional, field positional
patrick moyes » patrick keyes, patrick mayen, patrick mons
patrick del » patrick de, patrick dobel, patrick dale

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 moyes practical astronomy surveys ) OR ( the patrick del positional astronomy surveys )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moyes practical astronomy surveys ) or ( the patrick del positional astronomy surveys ))*.