Perhaps you should try some spelling variations:
thien danh » thien anh, thien dang, thien thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong thuc » cong tac
thuc vung » thuc dung, thuc cung, thuc vong
vung dong » cong dong
dong dan » dong danh, duong dan, dong san
dan van » dang van, doan van, dao 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 ((hieu manh) or (thien danh)) - thanh cong thuc vung dong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien danh)) - thanh cong thuc vung dong dan van ban*.