Perhaps you should try some spelling variations:
exit during » credit during, mexico during
during risk » using risk, during crises, during crisis
among shiu » among sri, wong shiu
yang ying » yang jing, huang ying, liang ying
yang yang » wang yang, wang yan
among hiv » among heis, among di, among hr
und exit » und exil, aid exit, und east

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 ((yang ying) OR (yang yang)) und exit during risk ((among shiu) OR (among hiv)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yang ying) OR (yang yang)) und exit during risk ((among shiu) or (among hiv)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yang ying) OR (yang yang)) und exit during risk ((among shiu) or (among hiv)) ;*.