Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
hieu lang » chieu sang, hieu quang, nhieu tang
trong san » cong san, dong san, trong ca
doi hieu » doi chieu, doc hieu, doi hien
dung cua » dung luan, dung cho
cua dung » cua dang, cua dong, qua dung
phan cau » phan dau, phan cac, phan tu

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 dung cua dung ((trong san) or (trong cac)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh dung cua dung ((trong san) OR (trong cac)) phan cau.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh dung cua dung ((trong san) or (trong cac)) phan cau*.