Perhaps you should try some spelling variations:
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
trung hoc » trung quoc
hang cong » dang cong, hang nong, bang cong
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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 sang) OR (chieu xanh)) - hanh ((trung va) or (trung hoc)) hang cong dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu xanh)) - hanh ((trung va) OR (trung hoc)) hang cong dan than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (chieu xanh)) - hanh ((trung va) or (trung hoc)) hang cong dan than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (chieu xanh)) - hanh ((trung va) or (trung hoc)) hang cong dan than cap*.