Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
mai duoc » mai quoc, mai duc, mat duoc
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
dai hoi » dai hoc, dai hai, dai moi
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, lai hoi, mai doi
ky lang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, luc va

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 lang ((((mai hoi) or (mai duoc))) or (dai hoi)). hieu van cam xuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ((((mai hoi) OR (mai duoc))) OR (dai hoi)). hieu van cam xuc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang ((((mai hoi) or (mai duoc))) or (dai hoi)). hieu van cam xuc va hanh vai cua tre*.