Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy survey » astronomy surveys, autonomy survey, astronomy surveying
astronomy sergey » astronomy surveys, astronomy seven, astronomy large
moore practical » more practical, moocs practical, mouse practical
gene positional » game positional, gene position, guenon positional
patrick gene » patrick glenn, patrick penel, patrick anne

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 survey ) OR ( the patrick gene positional astronomy sergey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moore practical astronomy survey ) or ( the patrick gene positional astronomy sergey ))*.