Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhung cong » thong cong, hang cong, nhung don
toc thien » toc thieu, ton thien, duoc thien
minh tuan » anh tuan
dung cong » dung trong
san toan » van toan, dan toan, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thien hach - ((minh tuan) or (canh tranh)) va ((nhung cong) OR (dung cong)) san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thien hach - ((minh tuan) OR (canh tranh)) va ((nhung cong) OR (dung cong)) san toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thien hach - ((minh tuan) or (canh tranh)) va ((nhung cong) OR (dung cong)) san toan ban*".