Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy surveying » astronomy during
astronomy surveys » astronomy survey, astronomy survives, autonomy survey
rouse's practical » rouses practical, gough's practical, mouse practical
astronomy sergey » astronomy survey, astronomy seven, astronomy large
aware positional » aware position, swarm positional, aware conditional
moore practical » more practical, moocs practical, mouse practical
patrick rouse's » patrick rules, patrick moore's, patrick ross
patrick aware » patrick edward, patrick andrew, patrick bajari

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