Perhaps you should try some spelling variations:
thien dang » thien bang, thien danh, thien nang
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 va
cong tan » cong tac, cong san, cong thanh
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 dang - canh tranh cua nhung ((((cong van) OR (cong tan))) or (song van)) thanh tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien dang - canh tranh cua nhung ((((cong van) OR (cong tan))) OR (song van)) thanh tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien dang - canh tranh cua nhung ((((cong van) OR (cong tan))) or (song van)) thanh tai".
• Adding a wildcard symbol may retrieve word variants: hoc thien dang - canh tranh cua nhung ((((cong van) OR (cong tan))) or (song van)) thanh tai*.