Perhaps you should try some spelling variations:
during risk » using risk, during crises, during crisis
land costs » land cost, wind costs
wang yang » wang yan, wang liang, wang yanling
yang ying » yang yang, yang jing, huang ying
aid costs » id costs, wind costs, aid cases
how scale » how stable, how small, how space
how some » how women

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 ((land costs) OR (aid costs)) during risk ((how some) OR (how scale)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang ying ((land costs) OR (aid costs)) during risk ((how some) or (how scale)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yang ying ((land costs) OR (aid costs)) during risk ((how some) or (how scale)) ;*.