Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy surveying » astronomy during
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
sizes positional » cues positional, life positional, like positional
moocs practical » mics practical, abcs practical, ics practical
patrick moocs » patrick moore, patrick mons, patrick moyes
patrick sizes » patrick stiles, patrick suppes, patrick simon

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 moocs practical astronomy survives ) OR ( the patrick sizes positional astronomy surveying )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy survives ) or ( the patrick sizes positional astronomy surveying ))*.