Perhaps you should try some spelling variations:
thanh trung » thanh tung
cung trong » dung trong, cong trong, vung trong
hieu sang » chieu sang, hieu quang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
trung cao » truong cao, trung cap, trung co
trong ban » trong san, trong tan, trong quan
cao cung » cao chung, cao cuong, cao cong
ban pha » ban phap, ban nha, ban ha
pha cau » phan cau, phap cau, pha cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sang) or (hieu lang)) - thanh trung cao cung trong ban pha cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu lang)) - thanh trung cao cung trong ban pha cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu lang)) - thanh trung cao cung trong ban pha cau*.