Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trung » thanh trung, hanh trang, manh trung
trung co » trung bo, trong co, truong cao
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
than tap » toan tap, han tap, phan tap
co cong » cao cong, cho cong, bo cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) or (chinh sach)) - hanh trung co cong ((cong ban) OR (cong tan)) than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chinh sach)) - hanh trung co cong ((cong ban) OR (cong tan)) than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chinh sach)) - hanh trung co cong ((cong ban) OR (cong tan)) than tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chinh sach)) - hanh trung co cong ((cong ban) OR (cong tan)) than tap*.