Perhaps you should try some spelling variations:
chieu quang » hieu quang, thieu quang, chu quang
nhanh dang » nhanh dong, nhanh lang, nhanh mang
nhan dang » nhan dan, phan dang, tran dang
duong van » duong va, luong va, dang van
trong van » trong cac
ho chieu » theo chieu, hoc thieu, doi chieu
vat dung » van dung, va dung, viet dung
tan cau » toan cau, van cau, tan ca

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: ho chieu quang - ((nhanh dang) OR (nhan dang)) vat dung ((duong van) OR (trong van)) tan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu quang - ((nhanh dang) OR (nhan dang)) vat dung ((duong van) or (trong van)) tan cau~".
• Adding a wildcard symbol may retrieve word variants: ho chieu quang - ((nhanh dang) OR (nhan dang)) vat dung ((duong van) or (trong van)) tan cau*.