Perhaps you should try some spelling variations:
waste handling » data handling
wang handling » wang yanling, cargo handling, data handling
long thanh » luong thanh, long han, long trinh
ren tang » en tant, ren weng, ren yan
tang lay » tang li
lay long » day long, baby long, plan long

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang handling) OR (waste handling)) ((ya hua) or (wang hua)) ren tang lay long thanh ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang handling) OR (waste handling)) ((ya hua) OR (wang hua)) ren tang lay long thanh ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang handling) OR (waste handling)) ((ya hua) or (wang hua)) ren tang lay long thanh ;*".