Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cai » va cac, va bai, va dai
va cao » va cac, va co, va dao
va cam » va cham, va cac, va cau

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 ky lang xa hoi. hieu ((((va cam) or (va cai))) or (va cao)) xuc van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu ((((va cam) OR (va cai))) OR (va cao)) xuc van hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu ((((va cam) or (va cai))) or (va cao)) xuc van hanh dai cua tre*.