Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trung » thanh trung, manh trung, danh trung
hanh trang » thanh trung, canh tranh, hanh trinh
doi chieu » doc hieu, doi chi, ho chieu
dai luong » dai cuong, dai duong, do luong
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
khan cap » khan ap, than cap, khoan cam

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

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