Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac va
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: vu sach ky lang ha noi. hieu va cam ((xuc va) or (duc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky lang ha noi. hieu va cam ((xuc va) OR (duc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky lang ha noi. hieu va cam ((xuc va) or (duc va)) hanh vi cua tre*.