Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
lens practical » owens practical, plans practical, lens practice
moore nautical » board nautical, mile nautical, moore national
patrick lens » patrick glenn, patrick arens, patrick lentz

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 lens practical astronomy series ) OR ( the patrick moore nautical astronomy series )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick lens practical astronomy series ) or ( the patrick moore nautical astronomy series ))*.