Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
sach ty » sach tu, sach thu, xach tay
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
cham o » cham soc
o va » do va, so va, co va

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