Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh thuong, thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
truong pho » truong khoa, truong cao, truong bo
pho thong » he thong
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
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: hoi ((chieu sang) or (hieu quang)) - thanh truong pho thong ((cong dan) or (cong tac)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((chieu sang) OR (hieu quang)) - thanh truong pho thong ((cong dan) OR (cong tac)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoi ((chieu sang) or (hieu quang)) - thanh truong pho thong ((cong dan) or (cong tac)) toan tap*.