Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
nang tai » hang tai, sang tai, nang cao
tang tai » hang tai, dung tai, sang tao
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
van cam » van nam, van lam, van cau
sach ky » sach y, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
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: su ((sach ky) OR (sac ky)) ((nang tai) or (tang tai)) roi. hieu van cam luc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) ((nang tai) OR (tang tai)) roi. hieu van cam luc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) ((nang tai) or (tang tai)) roi. hieu van cam luc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) ((nang tai) or (tang tai)) roi. hieu van cam luc va hanh vai cua tre*.