Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
hoc thien » hoc hien, hoc thieu, hoc thiet
tranh ban » trinh ban, tranh hang, tranh luan
tran van » luan van
ban than » ban thanh, van thanh, ban hang
ban hanh » ban hang

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 hach - hanh ((tranh ban) or (tran van)) nhung cong ((ban than) or (ban hanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh ((tranh ban) OR (tran van)) nhung cong ((ban than) OR (ban hanh)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh ((tranh ban) or (tran van)) nhung cong ((ban than) or (ban hanh)) cau*.