Perhaps you should try some spelling variations:
nang khoa » hang khoa, dang khoa, nang hoa
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
khoa hoc » hoa hoc
cac xuc » cam xuc, cac nuoc, chat xuc
vai cua » dai cua, hai cua, lai cua
xuc van » duc van, luc van, vuc van
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, xach tay
ve cac » va cac, vien cac
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((sach ty) OR (sach thu)) nang khoa hoc. hieu ve cac xuc van hanh ((vi cua) or (vai cua)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ty) OR (sach thu)) nang khoa hoc. hieu ve cac xuc van hanh ((vi cua) OR (vai cua)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((sach ty) OR (sach thu)) nang khoa hoc. hieu ve cac xuc van hanh ((vi cua) or (vai cua)) cau*".