Perhaps you should try some spelling variations:
during crisis » during crises, housing crisis
boost during » roosts during, books during, boom during
huang ying » huang jing, huang ting, huang yang
wang yang » wang yan, wang liang, wang yanling
can boost » a boost, can best
how slum » how slow, how sub, how sun

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((huang ying) or (wang yang)) can boost during crisis how slum ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((huang ying) OR (wang yang)) can boost during crisis how slum ;*.