Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
position astronomy » positional astronomy, causation astronomy, evolution astronomy
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moore practical » more practical, moocs practical, mouse practical
gene position » eigene position, gender position, gene 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 sergey ) OR ( the patrick gene position astronomy survives )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moore practical astronomy sergey ) or ( the patrick gene position astronomy survives ))*.