Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
trung vap » trung cap, trung va, trung van
vap nhung » va nhung, ve nhung, voi nhung
cong sanh » cong danh, cong sach, cong thanh
cong san » cong tac
ca cau » cua cau, cac cau, can cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sang) or (hieu quang)) - thanh trung vap nhung ((cong sanh) OR (cong san)) ca cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu quang)) - thanh trung vap nhung ((cong sanh) OR (cong san)) ca cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) or (hieu quang)) - thanh trung vap nhung ((cong sanh) OR (cong san)) ca cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) or (hieu quang)) - thanh trung vap nhung ((cong sanh) OR (cong san)) ca cau*.