Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
dung cong » dung trong
tong cong » trong cong, cong cong, dang cong
hoc hiem » hoc thieu, hoc thiet, hoc nhiet
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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

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