Perhaps you should try some spelling variations:
thanh tung » thanh cong
hang luong » nang luong, hang thuong, hoang vuong
hieu sang » chieu sang, hieu quang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
han luong » phan luong, van luong, hai luong
tung cap » trung cap, cung cap, thong cap
van toan » van tuan, van tan, van thanh
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sang) OR (hieu lang)) - thanh tung cap ((han luong) or (hang luong)) van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu lang)) - thanh tung cap ((han luong) OR (hang luong)) van toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) OR (hieu lang)) - thanh tung cap ((han luong) or (hang luong)) van toan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) OR (hieu lang)) - thanh tung cap ((han luong) or (hang luong)) van toan cau*.