Perhaps you should try some spelling variations:
waste handling » data handling
handling y.c » handling 4.1, handling 5.2, handling 2.4
hua rents » hua ren
yang minh » sang minh, yang mind, kang minah
kong saur » kong sar, kong siu, kong your
wong sam » wong sau, kong sar, von sam

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

• Performing a fuzzy search may retrieve terms with similar spellings: waste handling y.c hua rents yang minh ((((wong sam) OR (wong lai))) or (kong saur)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: waste handling y.c hua rents yang minh ((((wong sam) OR (wong lai))) OR (kong saur)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "waste handling y.c hua rents yang minh ((((wong sam) OR (wong lai))) or (kong saur)) ;*".