Perhaps you should try some spelling variations:
biet nghi » biet nguoi, viet nghin, biet noi
hoc biet » hoc viet, khac biet, hoc thiet
nghi cua » nghia cua, nghe cua, ngai cua
su sach » so sach, vu sach
nha hoc » nha thuoc, khoa hoc, nha nuoc
doc vi » don vi, doc va, doc viet
hoc vi » hoc va, hoc viet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach nha hoc biet nghi cua ets : nhung bai ((doc vi) OR (hoc vi)) đai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach nha hoc biet nghi cua ets : nhung bai ((doc vi) OR (hoc vi)) đai*".