Perhaps you should try some spelling variations:
wang managing » ag managing, change managing, making managing
managing land » managing demand, managing labor, managing large
land hat » land data, land a, hard hat
fan xibo » fan xing
wong sam » wong sau, wong lai, kong sar
ong sar » kong sar, ong sean, wong sau

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: wang managing land hat ((fan xibo) OR (li ying)) hong ((ong sar) OR (wong sam)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang managing land hat ((fan xibo) or (li ying)) hong ((ong sar) OR (wong sam)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang managing land hat ((fan xibo) or (li ying)) hong ((ong sar) OR (wong sam)) ;*.