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
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac
phan cau » phan dau, phan cac, phan tu

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 ((((than cap) OR (khan cap))) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh tranh qua dung cong dan ((((than cap) OR (khan cap))) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - canh tranh qua dung cong dan ((((than cap) OR (khan cap))) or (phan cau))".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh qua dung cong dan ((((than cap) OR (khan cap))) or (phan cau))*.