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
khoan cam » khoa cam, khoan va, phan cam
doc hieu » toc thieu, hoc thieu, hoc hien
qua dung » quang dung, su dung, qua song
cong dan » cong san, cong tan, huong dan
khan cap » khan ap, than cap, phan cau
phan cac » nhan cach, phan dau, phan lap

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 ((((khan cap) or (phan cac))) or (khoan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh tranh qua dung cong dan ((((khan cap) OR (phan cac))) OR (khoan cam)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh qua dung cong dan ((((khan cap) or (phan cac))) or (khoan cam))*.