Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ky » sach y, sach ty, sach kem
hanh de » hanh ve, hanh kem
xuc van » duc van, luc van, xuc ban
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc

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) or (sac ky)) nang ((x hoi) or (o hoc)). hieu ve cam xuc van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang ((x hoi) OR (o hoc)). hieu ve cam xuc van hanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang ((x hoi) or (o hoc)). hieu ve cam xuc van hanh de cua tre*.