Perhaps you should try some spelling variations:
nang tai » hang tai, sang tai, nang cao
tang tai » hang tai, dung tai, sang tao
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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 ((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 ((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 ((nang tai) or (tang tai)) roi. hieu van cam luc va hanh vai cua tre*.