Perhaps you should try some spelling variations:
thien quan » trien quang, lien quan, thien van
thanh tran » thanh trang, thanh toan, thanh tra
hieu quan » hieu qua, lieu quan, lien quan
tran tuan » tran xuan, tran quang, tran thanh
tuan dung » tuan duong, tran dung, tan dung
cuong tap » luong tap, cong tac, luong tai
cong tap » cong tac, cong tan, tong tap
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: thien ((hieu quan) or (thien quan)) - thanh tran tuan dung ((cong tap) OR (cuong tap)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien ((hieu quan) OR (thien quan)) - thanh tran tuan dung ((cong tap) OR (cuong tap)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thien ((hieu quan) or (thien quan)) - thanh tran tuan dung ((cong tap) OR (cuong tap)) toan cau".
• Adding a wildcard symbol may retrieve word variants: thien ((hieu quan) or (thien quan)) - thanh tran tuan dung ((cong tap) OR (cuong tap)) toan cau*.