Perhaps you should try some spelling variations:
thien bang » khien bang, thien ban, thien dang
hoc thien » hoc hien, hoc thieu, hoc thiet
tranh cua » doanh cua, manh cua
cua nhung » va nhung
thanh tai » thanh hai, thanh toan, doanh tai
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien bang - canh tranh cua nhung ((cong van) or (song van)) thanh tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien bang - canh tranh cua nhung ((cong van) OR (song van)) thanh tai.
• Adding a wildcard symbol may retrieve word variants: hoc thien bang - canh tranh cua nhung ((cong van) or (song van)) thanh tai*.