Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
dang mam » dang nam, dang mau, dang mat
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
dang ma » dang mau, dang mat, tang ma
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: te sach ky ((dang ma) or (dang mam)) hoi. hieu ve cam duc va ((hanh vai) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((dang ma) OR (dang mam)) hoi. hieu ve cam duc va ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((dang ma) or (dang mam)) hoi. hieu ve cam duc va ((hanh vai) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((dang ma) or (dang mam)) hoi. hieu ve cam duc va ((hanh vai) OR (hanh vi)) cua tre*.