Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu xanh » chieu xanh, hieu manh, hieu nganh
chua dong » ha dong, huy dong, hoa dong
cong dang » cong dong, cong dung, cong danh
thanh cac » hanh cac, thanh bac, thanh ca
doc hieu » toc thieu, hoc thieu, hoc hien
cua dong » cua cong, cua dang, cua nong
cong dan » cong san, cong tan, huong dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - hanh tranh ((cua dong) OR (chua dong)) ((cong dang) or (cong dan)) thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh tranh ((cua dong) OR (chua dong)) ((cong dang) OR (cong dan)) thanh cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh tranh ((cua dong) OR (chua dong)) ((cong dang) or (cong dan)) thanh cac*".