Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
hanh tranh » canh tranh, hanh trinh, hanh trang
thong cong » trong cong, tong cong, thong thong
tranh cua » doanh cua, manh cua
kim ngan » kim ngoc
van toan » van tuan, van thanh, manh toan
hoc kim » hoc ki, nhuoc kim, hoc kinh
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 kim ngan - hanh tranh cua ((nhung cong) or (thong cong)) ((van toan) OR (van tan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc kim ngan - hanh tranh cua ((nhung cong) OR (thong cong)) ((van toan) OR (van tan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc kim ngan - hanh tranh cua ((nhung cong) or (thong cong)) ((van toan) OR (van tan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc kim ngan - hanh tranh cua ((nhung cong) or (thong cong)) ((van toan) OR (van tan)) cao*.