Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh tang » hanh trang, anh tang, hanh mang
cua khong » cua phuong, cua thuong, cua cong
hua khong » hoa khong, hoac khong, phuc khong
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan tap » toan 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 tang ((cua khong) OR (hua khong)) ((cong dan) or (cong tan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh tang ((cua khong) OR (hua khong)) ((cong dan) OR (cong tan)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh tang ((cua khong) OR (hua khong)) ((cong dan) or (cong tan)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh tang ((cua khong) OR (hua khong)) ((cong dan) or (cong tan)) toan tap*.