Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy survey » astronomy surveys, autonomy survey, astronomy surveying
astronomy sergey » astronomy surveys, astronomy seven, astronomy large
mons practical » coins practical, lens practical, loss practical
patrick mons » patrick moyes, patrick bond, patrick mpondo
nos nautical » logs nautical, hoc nautical, some nautical
patrick nos » patrick nomo, patrick bas, patrick n

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 mons practical astronomy survey ) OR ( the patrick nos nautical astronomy sergey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick mons practical astronomy survey ) or ( the patrick nos nautical astronomy sergey ))*.