Perhaps you should try some spelling variations:
thanh trung » thanh tung
tong thong » thong thong, dong thong, cong thong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cap » truong cao, trung tam
doi hieu » doi chieu, doc hieu, doi hien
cap tong » cap nong, cap hoang, gap trong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

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