Perhaps you should try some spelling variations:
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
course practical » yourself practical, concise practical, care practical
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
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 sergey)).
• Adding a wildcard symbol may retrieve word variants: the patrick course practical ((astronomy survives) or (astronomy sergey))*.