Perhaps you should try some spelling variations:
exit during » credit during, mexico during
during risk » using risk, during crises, during crisis
liang yang » liang ying, wang yang, huang yang
among shiu » among hiv, among sri, wong shiu
yang yang » wang yang, wang yan
den exit » eu exit, new exit

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 ((liang yang) OR (yang yang)) den exit during risk among shiu ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((liang yang) or (yang yang)) den exit during risk among shiu ;*.