Perhaps you should try some spelling variations:
lost patients » les patients, cost patient, cleft patients
patients sex » patients self, patients en, patients per
wang liang » wang yang
wang wang » wang yang, wang yan, wang yong
yang yang » wang yang, wang yan
sex among » eu among, mix among
yang fan » zhang fan, yang dean, yang jin

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: ((wang wang) OR (wang liang)) ((yang yang) OR (yang fan)) lost patients sex among health ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang wang) or (wang liang)) ((yang yang) or (yang fan)) lost patients sex among health ;*.