Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va
ma hoi » mai hoi, xa hoi, me hoi

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