Perhaps you should try some spelling variations:
dang nguong » dang thuong, tang nguon, dang cuong
hieu quang » thieu quang, hieu quan, hieu qua
dung nguon » dung nguoi, luong nguon, dung ngan
theo hieu » theo chieu, theo tieu, thien hieu
hanh mang » nhanh mang, hanh trang, nhanh lang
mang cua » manh cua, dung cua, ban cua
dan than » dan chan, ban than, van than
than man » than ma, thanh san, tran manh

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu quang - hanh mang cua ((dang nguong) or (dung nguon)) dan than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu quang - hanh mang cua ((dang nguong) OR (dung nguon)) dan than man.
• Adding a wildcard symbol may retrieve word variants: theo hieu quang - hanh mang cua ((dang nguong) or (dung nguon)) dan than man*.