Perhaps you should try some spelling variations:
thien dang » thien bang, thien danh, thien nang
cong thuat » trong thuat, vuong thuat, cong thuc
thuat dung » thuat hung, thuat ung, thuat xung
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung dong » dung cong, vung dong, dung trong
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 dang)) - thanh cong thuat dung dong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien dang)) - thanh cong thuat dung dong dan van ban*.