Perhaps you should try some spelling variations:
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
madan positional » data positional, images positional, mystax positional
does positional » cues positional, des positionalen, does conditional
astronomy study » astronomy studies, astronomy south, astronomy star
patrick madan » patrick haldane, patrick modiano, patrick maxton
patrick does » patrick dobel, patrick de, patrick del

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 does positional astronomy study ) OR ( the patrick madan positional astronomy surveys )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick does positional astronomy study ) or ( the patrick madan positional astronomy surveys ))*.