Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh cua » doanh cua, manh cua
doc hieu » toc thieu, hoc thieu, hoc hien
ban cong » bang cong, van cong, phan cong
cong dan » cong san, cong tan, huong dan
hanh tap » han tap, hang tap, hanh cap
hanh tai » thanh tai, hang tai, han tai

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 - canh tranh cua ban cong dan ((hanh tap) or (hanh tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh tranh cua ban cong dan ((hanh tap) OR (hanh tai)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh cua ban cong dan ((hanh tap) or (hanh tai))*.