Perhaps you should try some spelling variations:
mai hoi » mai khoi, dai hoi, lai hoi
vai cua » dai cua, hai cua, lai cua
ban vai » ban va, ban gai, ban tai
soc van » hoc van, oc van, sac van
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
ma hoi » xa hoi, ma hoa, 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: tu ((sach ty) or (sach y)) nang ((ma hoi) OR (mai hoi)). hieu ve cham soc van ban vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ((ma hoi) OR (mai hoi)). hieu ve cham soc van ban vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang ((ma hoi) OR (mai hoi)). hieu ve cham soc van ban vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang ((ma hoi) OR (mai hoi)). hieu ve cham soc van ban vai cua tre*.