Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu lang » chieu sang, hieu quang, nhieu tang
trung cap » truong cao, trung tam
dung cong » dung trong
cap dung » ap dung, cao dung, chan dung
cong tac » cong ty
tac dan » tac danh, cac dan, tac da

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu tinh) or (hieu lang)) - thanh trung cap dung cong tac dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu tinh) OR (hieu lang)) - thanh trung cap dung cong tac dan ca.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu tinh) or (hieu lang)) - thanh trung cap dung cong tac dan ca*.