Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
lang mai » lang dai, lang hai, lang man
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
phu san » phi san, thuy san
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
san ky » sang ky, van ky, dan ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: phu san ky ((lang mai) or (nang tai)) hoi. hieu van cam duc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: phu san ky ((lang mai) OR (nang tai)) hoi. hieu van cam duc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: phu san ky ((lang mai) or (nang tai)) hoi. hieu van cam duc va hanh vai cua tre*.