Perhaps you should try some spelling variations:
ban vanh » ban hanh, ban van, ban anh
vanh dai » van dai, vanh tai, lanh dao
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
soc ban » hoc ban, coc ban, so ban
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang ma) or (sang ma)) hoi. hieu ve cham soc ban vanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang ma) OR (sang ma)) hoi. hieu ve cham soc ban vanh dai cua tre*.