Perhaps you should try some spelling variations:
graphical astronomy » tropical astronomy, nautical astronomy, optical astronomy
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
patrick blocks » patrick blake, patrick blackett

You may be able to get more results by adjusting your search query.

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