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 cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan tap » toan ban

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

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