Perhaps you should try some spelling variations:
thanh tung » thanh cong
hien hanh » dieu hanh
tong cong » trong cong, cong cong, dung cong
dan toan » van toan, dan than, manh toan
tung va » trung va, tuong va, dung va
va tong » va thong, va tuong, va trong
van tan » van tuan, van ban, van tai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hanh - thanh tung va tong cong ((dan toan) or (van tan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - thanh tung va tong cong ((dan toan) OR (van tan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - thanh tung va tong cong ((dan toan) or (van tan)) cao*.