Perhaps you should try some spelling variations:
blocks graphical » lock graphical, blocks radical, brown's graphical
blocks practical » clocks practical, books practical, rocks practical
astronomy sergey » astronomy surveys, astronomy seven, astronomy large
astronomy survey » astronomy surveys, autonomy survey, astronomy surveying

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