Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung thong » trung trong, trung thang, truong thuong
chieu sang » chieu sach, chieu xanh, nhieu tang
thong dung » thong cong, thong thuong
dung phung » dung phuong, dung chung, dung nhung
hieu lang » hieu quang, nhieu tang, hieu van
van than » van thanh, van thang, van tuan
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (hieu lang)) - thanh trung thong dung phung van than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - thanh trung thong dung phung van than cap.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - thanh trung thong dung phung van than cap*.