Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
cham xuc » cam xuc, chat xuc, cham soc
dua tren » dung tren
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc va
vi dua » vi du, vi dum, vi lua

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: ((te sach) OR (((toc sach) OR (hoc sach)))) ky nang x ho. hieu va cham xuc va hanh vi dua tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (((toc sach) OR (hoc sach)))) ky nang x ho. hieu va cham xuc va hanh vi dua tren~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (((toc sach) OR (hoc sach)))) ky nang x ho. hieu va cham xuc va hanh vi dua tren*.