Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
tong cong » trong cong, cong cong, dung cong
van toan » van tuan, van thanh, manh toan
ki ngan » kim ngan, k ngan, i ngan
van tan » van tuan, van ban, van tai
hoc ki » hoc ky, hoc kinh, hoc khoi

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

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