Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, positional astronomy
astronomy survives » astronomy survey, astronomy surveys
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy studies » astronomy study, economy studies, astronomy status
moore practical » moocs practical, mouse practical, course practical
more practical » some practical
patrick more » patrick moyes, patrick mkie, patrick mark
more optical » moire optical, mode optical, core optical

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