Perhaps you should try some spelling variations:
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy study » astronomy studies, astronomy south, astronomy star
patrick moocs » patrick moore, patrick mons, patrick moyes
moocs optical » moon optical, topics optical, dots optical
patrick mayen » patrick bayer, patrick madan, patrick moyes
mayen optical » main optical, mayer optimal, modern optical

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 moocs optical astronomy study ) OR ( the patrick mayen optical astronomy surveys ))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs optical astronomy study ) OR ( the patrick mayen optical astronomy surveys ))*.