Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh tai, hanh van
cham duc » pham duc, cham soc, pham duy
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
man hoi » man hoai, dan hoi, mai hoi
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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

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