Perhaps you should try some spelling variations:
thien danh » thien anh, thien dang, thien thanh
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tung cua » trung cua, tuong cua, dung cua
ban cong » bang cong, van cong, phan cong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan 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 danh) or (hieu manh)) - thanh tung cua ban cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (hieu manh)) - thanh tung cua ban cong tan van ban*.