Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
thanh tran » thanh trang, thanh toan, thanh tra
thong cong » trong cong, tong cong, thong thong
van thong » van thuong, van phong, va thong
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca cau

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) or (vien bach)) - thanh tran van thong cong dan can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (vien bach)) - thanh tran van thong cong dan can cau*.