Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
than cap » khan cap, thanh lap, thanh cac
phan cac » nhan cach, phan dau, phan lap
phan cau » phan dau, phan tu, phan lap

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 - hanh trinh cua dung cong tan ((((than cap) OR (phan cac))) OR (phan cau))~.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh trinh cua dung cong tan ((((than cap) or (phan cac))) or (phan cau))*.