Perhaps you should try some spelling variations:
tien thanh » tien thinh, den thanh
tran thanh » ban thanh, van thanh, quan thanh
bang cong » bang song, hang cong, dung cong
dang cong » dung cong
tranh va » tranh van, trang va, trinh va
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tien thanh) or (tran thanh)) - canh tranh va ((bang cong) or (dang cong)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien thanh) OR (tran thanh)) - canh tranh va ((bang cong) OR (dang cong)) dan toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien thanh) or (tran thanh)) - canh tranh va ((bang cong) or (dang cong)) dan toan tap*.