Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai

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