Perhaps you should try some spelling variations:
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
hien hanh » dieu hanh
hien anh » thien anh, dien anh, tien anh
cong van » cong vang, cong san, song van
van tan » van tuan, van ban, van tai
tan cao » toan cao, tao cao, tay cao

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 anh) or (hien hanh)) - ((thanh trung) OR (thanh tung)) va nhung cong van tan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien anh) OR (hien hanh)) - ((thanh trung) OR (thanh tung)) va nhung cong van tan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien anh) or (hien hanh)) - ((thanh trung) OR (thanh tung)) va nhung cong van tan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien anh) or (hien hanh)) - ((thanh trung) OR (thanh tung)) va nhung cong van tan cao*.