Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
hieu lang » chieu sang, hieu quang, nhieu tang
manh tung » manh hung, thanh tung
luan nang » luan van, van nang
trong tap » trong thap, tong tap, trong tan
doc hieu » toc thieu, hoc thieu, hoc hien
luan san » luan van, luan hoan, luan phan
tap quan » tac quan, hai quan
quan cau » quang cao, toan cau, quan ha

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: doc hieu lang - ((manh tung) OR (nhanh mang)) ((luan nang) OR (luan san)) trong tap quan cau~.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - ((manh tung) or (nhanh mang)) ((luan nang) or (luan san)) trong tap quan cau*.