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 tuan » trung thanh, trung tam, tran tuan
tuan trong » thuan trong, quan trong, tran trong
thanh dam » thanh dat, thanh nam, thanh tam
cong tan » cong tac, cong san, cong thanh
khan dam » chang dam, khanh nam, khoan dau

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