Perhaps you should try some spelling variations:
thong duong » tuong duong, thong dung, thong huong
thanh tuong » thanh thuong, thanh tung, thanh huong
hieu lang » chieu sang, hieu quang, nhieu tang
kenh phan » benh nhan, benh phau, ke phan
doi hieu » doi chieu, doc hieu, doi hien
tuong ca » truong ca, tuong cay, tuong cua
ca thong » ca thuong, cac thong, va thong
xen phan » dien phan, benh phan, tren phan

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 tuong ca thong duong ((xen phan) or (kenh phan)) dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh tuong ca thong duong ((xen phan) OR (kenh phan)) dau*.