Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
hoc sach » hoc sinh, hoc cac, hoc anh
xuc van » duc van, luc van, vuc van
cua cau » cua cac, cua chu, cua cay
xang co » nang co, lang co, tang co
ve cac » va cac, vien cac
vi cua » vai cua, di cua
va cai » va cac, va bai, va dai

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

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