Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
danh thin » canh thin, danh thanh, danh thang
thin phan » tin phan, than phan, thanh phan
phan dang » phan dau, phan cong, nhan dan
dang cong » dung cong
kham phan » phap phan, dam phan, khai pha
toc hieu » toc thieu, doc hieu, hoc thieu

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: toc hieu lang - danh thin phan dang cong ((kham phan) OR (kham pha)) bi~.
• Adding a wildcard symbol may retrieve word variants: toc hieu lang - danh thin phan dang cong ((kham phan) or (kham pha)) bi*.