Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
chieu sang » chieu sach, chieu xanh, hieu lang
nang trong » nang truong, lang trong, mang trong
doi chieu » doc hieu, doi chi, ho chieu
hanh tung » thanh tung, manh tung, hanh dung
luan nang » luan van, van nang, luan san
tap quan » hai quan

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: doi chieu sang - ((hanh tung) OR (nhanh mang)) luan nang trong ((tap quan) OR (tac quan)) ha~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((hanh tung) or (nhanh mang)) luan nang trong ((tap quan) OR (tac quan)) ha~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((hanh tung) or (nhanh mang)) luan nang trong ((tap quan) OR (tac quan)) ha*.