Perhaps you should try some spelling variations:
nhanh lang » nhanh quang, nhanh thang, nhan dang
hieu lang » chieu sang, hieu quang, nhieu tang
hanh mang » nhanh mang, hanh trang, thanh hang
trong dan » trong dang, trong san, trong tan
doi hieu » doi chieu, doc hieu, doi hien
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 - ((hanh mang) or (nhanh lang)) ung dung trong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - ((hanh mang) OR (nhanh lang)) ung dung trong dan toan cau*.