Perhaps you should try some spelling variations:
contract based » control based, content based, context based
yang study » yang judy
arg study » dog study, emg study, ieg study
young ghi » young choi, hong ghi, young get
based a » based ai, based ad, based na
a young » _ young
wang » wan, lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (wang or wing) yao ((yang study) OR (arg study)) contract based a young ghi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wang OR wing) yao ((yang study) OR (arg study)) contract based a young ghi ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wang or wing) yao ((yang study) OR (arg study)) contract based a young ghi ;".
• Adding a wildcard symbol may retrieve word variants: (wang or wing) yao ((yang study) OR (arg study)) contract based a young ghi ;*.