Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
ve cham » va cham, ve chat, vu cham
dang ma » dang mau, dang mam, dang mat
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ve cam » ve cac, va cam, ve cai
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky dang ma hoi. hieu ((ve cam) or (ve cham)) ((xuc va) OR (tuc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky dang ma hoi. hieu ((ve cam) OR (ve cham)) ((xuc va) OR (tuc va)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky dang ma hoi. hieu ((ve cam) or (ve cham)) ((xuc va) OR (tuc va)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky dang ma hoi. hieu ((ve cam) or (ve cham)) ((xuc va) OR (tuc va)) hanh vai cua tre*.