Perhaps you should try some spelling variations:
astronomy sergey » astronomy surveys, astronomy seven, astronomy large
astronomy survey » astronomy surveys, autonomy survey, astronomy surveying
moore practical » more practical, moocs practical, mouse practical

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 moore practical ((astronomy sergey) OR (astronomy survey))".
• Adding a wildcard symbol may retrieve word variants: the patrick moore practical ((astronomy sergey) OR (astronomy survey))*.