Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
thanh tung » thanh cong
hoc thien » hoc hien, hoc thieu, hoc thiet
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap
can ban » van ban, toan ban
cac van » cac dan

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 - ((thanh trung) or (thanh tung)) ((can ban) or (cac van)) cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - ((thanh trung) OR (thanh tung)) ((can ban) OR (cac van)) cong tan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - ((thanh trung) or (thanh tung)) ((can ban) or (cac van)) cong tan toan cau*.