Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hien xanh » hien hanh, hien nhanh, chieu xanh
cong toan » cong hoan, cong tuan, cong doan
van dung » van dong, xay dung, tin dung
cong tan » cong tac, cong san, cong thanh
va dung » va duong, vat dung, va ung
ban ban » ban banh, van ban, can ban

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