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
thanh cac » hanh cac, thanh bac, thanh ca
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 » khan cap, thanh lap, than cua
phan dau » phan tu, hang dau

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

• 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 (thanh cac))) OR (phan dau))~.
• 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 (thanh cac))) or (phan dau))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh qua dung cong dan ((((than cap) OR (thanh cac))) or (phan dau))*.