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 dung » phan ung, phan dang, chan dung
dung cong » dung trong
phap phan » phap phat, phap hoan, phap luan
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 dung cong ((phap phan) OR (kham pha)) bi~.
• Adding a wildcard symbol may retrieve word variants: toc hieu lang - danh thin phan dung cong ((phap phan) or (kham pha)) bi*.