Perhaps you should try some spelling variations:
during crisis » during crises, housing crisis
crisis case » crisis cases, crises case, crisis causes
iot during » boost during, built during, sport during
wang yang » wang yan, wang liang, wang yanling
case shu » case s0, case sub
yang d » yang du, yang _, yang 8

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang ((yang d) OR (yang di)) iot during crisis case shu ;~".
• Adding a wildcard symbol may retrieve word variants: wang yang ((yang d) OR (yang di)) iot during crisis case shu ;*.