Perhaps you should try some spelling variations:
trung thanh » truong thanh
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
trung tuan » trung tam, tran tuan, truong thanh
tan thanh » tran thanh, tang thanh, toan thanh
thanh nam » hanh nam, thanh tam, thanh pham
cong tan » cong tac, cong san, cong thanh

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 tuan) OR (trung thanh)) trong cong tan thanh nam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu quang)) - thanh ((trung tuan) OR (trung thanh)) trong cong tan thanh nam.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu quang)) - thanh ((trung tuan) OR (trung thanh)) trong cong tan thanh nam".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu quang)) - thanh ((trung tuan) OR (trung thanh)) trong cong tan thanh nam*.