Perhaps you should try some spelling variations:
sharing risk » sharing best, during risk
cheng zhang » cheng han, zhen zhang, chen zheng
zhang ying » zhang ming, zhang jing, zhang ping
end cost » end close, land cost, end iot
how slum » how slow, how sub, how sun
eu cost » au costa, der cost, eu court
how shu » how she, how shih

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: cheng zhang ying ((eu cost) OR (end cost)) sharing risk ((how shu) OR (how slum)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cheng zhang ying ((eu cost) or (end cost)) sharing risk ((how shu) OR (how slum)) ;~".
• Adding a wildcard symbol may retrieve word variants: cheng zhang ying ((eu cost) or (end cost)) sharing risk ((how shu) OR (how slum)) ;*.