Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung thanh » truong thanh
thieu sang » chieu sang, thieu khang, thieu quang
thanh hung » thanh huong, thanh tung, thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
cong sang » cong lang, cong vang, cong bang
cong san » cong tac
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: hoc ((thieu sang) or (hieu lang)) - thanh trung thanh hung ((cong san) or (cong sang)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (hieu lang)) - thanh trung thanh hung ((cong san) OR (cong sang)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (hieu lang)) - thanh trung thanh hung ((cong san) or (cong sang)) toan tap*.