Perhaps you should try some spelling variations:
taking factory » teaching factory, packing factor, sewing factory
making factors » making factories, damping factors, shaping factors
zhang yan » zhang fan, zhang jian, wang yan
what siu » what sino, what did, what 4ir
fa risk » a risk, cva risk, dam risk
kai fa » kai a, kai fang

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: ((zhang yan) OR (dof skin)) kai fa risk ((taking factory) OR (making factors)) what siu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((zhang yan) or (dof skin)) kai fa risk ((taking factory) OR (making factors)) what siu ;~".
• Adding a wildcard symbol may retrieve word variants: ((zhang yan) or (dof skin)) kai fa risk ((taking factory) OR (making factors)) what siu ;*.