Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy surveys » astronomy surveying, astronomy survives, astronomy sergey
model positional » model depositional, model position, model positions
astronomy survey » astronomy sergey, autonomy survey, astronomy surveying
moyes practical » modes practical, movies practical, moraes practical
patrick moyes » patrick keyes, patrick mayen, patrick mons
patrick model » patrick del, patrick bolder, patrick michel

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 moyes practical astronomy surveys ) OR ( the patrick model positional astronomy survey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moyes practical astronomy surveys ) or ( the patrick model positional astronomy survey ))*.