Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
dang mam » dang nam, dang mau, dang mat
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cuu tre, cua triet
dang ma » dang mau, dang mat, tang ma
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

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