Perhaps you should try some spelling variations:
thanh trung » thanh tung
hiem ngan » kim ngan, viem gan
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dung cong
cua tong » cua cong, cua dong, cua nong
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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

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