Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
han than » khan than, phan than, van than
ban than » ban thanh, van thanh, ban hang

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 quan)) - thanh trung cua thong thong ((han than) OR (ban than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu quan)) - thanh trung cua thong thong ((han than) OR (ban than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu quan)) - thanh trung cua thong thong ((han than) OR (ban than)) cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu quan)) - thanh trung cua thong thong ((han than) OR (ban than)) cau*.