Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
moocs practical » mics practical, abcs practical, ics practical
mons practical » coins practical, lens practical, owens practical
bond practical » bonds practical, bono practical, beyond practical
patrick moocs » patrick moore, patrick moyes, patrick moore's
patrick mons » patrick moyes, patrick mpondo, patrick timony
patrick bond » patrick d, patrick b, patrick d.d

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 series ) OR ((( the patrick mons practical astronomy series ) OR ( the patrick bond practical astronomy series )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick moocs practical astronomy series ) or ((( the patrick mons practical astronomy series ) OR ( the patrick bond practical astronomy series ))))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy series ) or ((( the patrick mons practical astronomy series ) OR ( the patrick bond practical astronomy series ))))*.