Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy surveying » astronomy during
astronomy survives » astronomy survey, astronomy studies
astronomy surveys » astronomy survey, astronomy sergey, autonomy survey
moocs practical » books practical, mics practical, colts practical
mayen practical » man practical, modern practical, seven practical
mons practical » coins practical, boss practical, lens practical
patrick moocs » patrick moore, patrick moyes, patrick moore's
patrick mayen » patrick bayer, patrick madan, patrick moyes
patrick mons » patrick moyes, patrick bond, patrick mpondo

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