Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
blocks practical » clocks practical, books practical, rocks practical
astronomy sergey » astronomy surveys, astronomy seven, astronomy large
astronomy survey » astronomy surveys, autonomy survey, astronomy surveying
blocks nautical » blocks radical, logs nautical, blocks graphical
patrick blocks » patrick blackett
blake nautical » board nautical
patrick blake » patrick blair, patrick wake, patrick case

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 blocks practical astronomy sergey ) OR ( the patrick blocks practical astronomy survey ))) OR ((( the patrick blocks nautical astronomy sergey ) OR ( the patrick blake nautical astronomy sergey )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( the patrick blocks practical astronomy sergey ) OR ( the patrick blocks practical astronomy survey ))) or ((( the patrick blocks nautical astronomy sergey ) or ( the patrick blake nautical astronomy sergey ))))".
• Adding a wildcard symbol may retrieve word variants: (((( the patrick blocks practical astronomy sergey ) OR ( the patrick blocks practical astronomy survey ))) or ((( the patrick blocks nautical astronomy sergey ) or ( the patrick blake nautical astronomy sergey ))))*.