Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
critical astronomy » optical astronomy, tropical astronomy, classical astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
astronomy survey » astronomy surveys, astronomy sergey, autonomy survey
board practical » boards practical, toward practical, board practices
astronomy large » astronomy sergey, astronomy line, astronomy long
moore nautical » board nautical, mile nautical, moore national
patrick board » patrick bond, patrick hubbard, patrick leonard
some critical » some practical
patrick some » patrick home, patrick sole, trick some

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 board practical astronomy series ) OR ((( the patrick some critical astronomy large ) OR ( the patrick moore nautical astronomy survey )))).
• Adding a wildcard symbol may retrieve word variants: (( the patrick board practical astronomy series ) or ((( the patrick some critical astronomy large ) or ( the patrick moore nautical astronomy survey ))))*.