Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hoang manh » hoang minh, hoang anh, hoang xanh
cong thanh » cong trinh, cong tan, truong thanh
dong thanh » truong thanh
hieu xanh » hieu manh, hieu nganh, dieu hanh
manh cua » doanh cua, ban cua
cua dang » cua cong, cua ban

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)) - hoang manh cua dang ((cong thanh) OR (dong thanh)) nhu cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - hoang manh cua dang ((cong thanh) OR (dong thanh)) nhu cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (chieu xanh)) - hoang manh cua dang ((cong thanh) OR (dong thanh)) nhu cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (chieu xanh)) - hoang manh cua dang ((cong thanh) OR (dong thanh)) nhu cau*.