Perhaps you should try some spelling variations:
practical astronomer » practical astronomers, practical astronomer's, practica astronomy
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomer services » gastronomic services, gastronomy services, gastronomic service
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
moocs practical » mics practical, abcs practical, ics practical
patrick moocs » patrick moore, patrick mons, patrick moyes

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 moocs practical astronomer services )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy survives ) or ( the patrick moocs practical astronomer services ))*.