Perhaps you should try some spelling variations:
astronomy survives » astronomy survey, astronomy studies
astronomy surveys » astronomy survey, astronomy surveying, astronomy sergey
course practical » yourself practical, concise practical, care practical
patrick course » patrick corsi, patrick case, patrick count

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 course practical ((astronomy survives) OR (astronomy surveys)).
• Adding a wildcard symbol may retrieve word variants: the patrick course practical ((astronomy survives) or (astronomy surveys))*.