Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh qua » tranh cua, thanh qua, trinh qua
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
qua dung » quang dung, su dung, qua song
cong dan » cong san, cong tan, huong dan
hanh tap » han tap, hang tap, hanh tam
hanh cap » hanh cac, hanh cat, hanh cad
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 qua dung cong dan ((((hanh tap) or (hanh cap))) or (hanh tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh tranh qua dung cong dan ((((hanh tap) OR (hanh cap))) OR (hanh tai)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh qua dung cong dan ((((hanh tap) or (hanh cap))) or (hanh tai))*.