Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
tang ma » mang may, tang van
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky
ma hoi » mai hoi, xa hoi, ma hoa
nam tu » nam thu, nam thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sai ky)) tang ma hoi. hieu van nam tu va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) tang ma hoi. hieu van nam tu va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sai ky)) tang ma hoi. hieu van nam tu va hanh vai cua tre*.