Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu xanh » hieu manh, hieu nganh, dieu hanh
dung cong » dung trong
chang cau » hang cau, nhung cau, cong cau
cong tac » cong ty
tac dung » sach dung, xay dung, tin dung
hang ca » hang va, nang cao, hang 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) or (chieu xanh)) - thanh cong tac dung cong san ((chang cau) OR (hang ca))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - thanh cong tac dung cong san ((chang cau) OR (hang ca)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (chieu xanh)) - thanh cong tac dung cong san ((chang cau) OR (hang ca))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (chieu xanh)) - thanh cong tac dung cong san ((chang cau) OR (hang ca))*.