Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
abcs practical » ics practical, mics practical, basics practical
apis practical » basis practical, his practical, basics practical
aris practical » basis practical, his practical, various practical
naef practical » beef practical, brief practical, chaff practical
patrick abcs » patrick bas, patrick arens, patrick darcy
patrick apis » patrick april, patrick alison, patrick arens
patrick aris » patrick april, patrick arens, patrick barwise
patrick naef » patrick baert, patrick bayer, patrick baker

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 abcs practical astronomy surveys ) OR ( the patrick apis practical astronomy surveys ))) OR ( the patrick aris practical astronomy surveys ))) OR ( the patrick naef practical astronomy surveys )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((( the patrick abcs practical astronomy surveys ) OR ( the patrick apis practical astronomy surveys ))) or ( the patrick aris practical astronomy surveys ))) or ( the patrick naef practical astronomy surveys ))".
• Adding a wildcard symbol may retrieve word variants: (((((( the patrick abcs practical astronomy surveys ) OR ( the patrick apis practical astronomy surveys ))) or ( the patrick aris practical astronomy surveys ))) or ( the patrick naef practical astronomy surveys ))*.