Perhaps you should try some spelling variations:
nang khoa » hang khoa, dang khoa, nang hoa
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
khoa hoc » hoa hoc
vuc van » duc van, luc van, thuc van
ty nang » ky nang, ty xang, ty hang
cua cau » cua cac, cua chu, cua cay
ve cac » vien cac
vi cua » vai 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: ((te sach) or (toc sach)) ty nang khoa hoc. hieu ((ve cac) OR (va cac)) vuc van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang khoa hoc. hieu ((ve cac) OR (va cac)) vuc van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty nang khoa hoc. hieu ((ve cac) OR (va cac)) vuc van hanh vi cua cau*".