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
tranh va » tranh van, trang va, trinh va
cong tan » cong tac, cong san, cong thanh
ban banh » ban hanh, ban anh, ban danh
va dung » van dung, va duong, vat dung
ban ban » van ban, can ban, ban dan

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