Perhaps you should try some spelling variations:
nhung tuong » nhung huong, nhung phuong, hung vuong
thieu sang » thieu khang, thieu quang, hieu lang
dien quang » diep quang, trien quang, lien quan
chieu sang » chieu sach, chieu xanh, hieu lang
hanh mang » nhanh mang, hanh trang, nhanh lang
cua nhung » va nhung
tuong dan » huong dan, tung dan, xuong dan
mang cua » manh cua, dung cua, ban cua
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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: hoc ((((thieu sang) OR (dien quang))) OR (chieu sang)) - hanh mang cua nhung tuong dan toan cao~.
• Adding a wildcard symbol may retrieve word variants: hoc ((((thieu sang) or (dien quang))) or (chieu sang)) - hanh mang cua nhung tuong dan toan cao*.