Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac va
di cua » dai cua, doi cua, de cua

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: tu sach y nang x ho. hieu va cam ((((xuc va) OR (duc va))) OR (truc va)) hanh di cua vat~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x ho. hieu va cam ((((xuc va) or (duc va))) or (truc va)) hanh di cua vat*.