Perhaps you should try some spelling variations:
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
patrick hanc » patrick hanks, patrick hall, patrick hunt
patrick hung » patrick chung, patrick hunt, patrick cheung
patrick hoc » patrick home, patrick c, patrick h

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 hoc) OR (((patrick hanc) OR (patrick hung)))) nautical astronomy surveys.
• The words AND, OR and NOT may confuse the search; try adding quotes: "the ((patrick hoc) or (((patrick hanc) OR (patrick hung)))) nautical astronomy surveys".
• Adding a wildcard symbol may retrieve word variants: the ((patrick hoc) or (((patrick hanc) OR (patrick hung)))) nautical astronomy surveys*.