Perhaps you should try some spelling variations:
dang mam » dang nam, dang mau, dang mat
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach y, sach ty
dang ma » dang mau, dang mat, tang ma
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
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: toc sach ky ((dang ma) or (dang mam)) hoi. hieu ve cam duc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((dang ma) OR (dang mam)) hoi. hieu ve cam duc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((dang ma) or (dang mam)) hoi. hieu ve cam duc va hanh vai cua tre*.