Perhaps you should try some spelling variations:
cost during » boost during, crust during, west during
during risk » using risk, during crises, during crisis
liang yang » liang ying, wang yang, huang yang
among heis » among ers, among hiv, among jews
yang yang » wang yang, wang yan
among hui » among eu, tong hui, among di
eu cost » au costa, der cost, end cost

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((liang yang) or (yang yang)) eu cost during risk ((among hui) OR (among heis)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((liang yang) OR (yang yang)) eu cost during risk ((among hui) OR (among heis)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((liang yang) or (yang yang)) eu cost during risk ((among hui) OR (among heis)) ;".
• Adding a wildcard symbol may retrieve word variants: wang ((liang yang) or (yang yang)) eu cost during risk ((among hui) OR (among heis)) ;*.