Perhaps you should try some spelling variations:
sharing covid » during covid, sharing hold, sharing oil
sharing food » sharing hold, securing food, sharing forms
zhang yan » zhang fan, zhang jian, wang yan
xi zhang » li zhang, xiao zhang, bin zhang
dan data » can data, dan dana, dn data
can tata » can data, can take, can tax

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: xi zhang yan ((dan data) OR (can tata)) ((sharing food) OR (sharing covid)) kong (sar OR saur) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "xi zhang yan ((dan data) or (can tata)) ((sharing food) OR (sharing covid)) kong (sar or saur) ;~".
• Adding a wildcard symbol may retrieve word variants: xi zhang yan ((dan data) or (can tata)) ((sharing food) OR (sharing covid)) kong (sar or saur) ;*.