Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
mai hoi » mai khoi, dai hoi, lai hoi
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
van cam » van nam, van lam, van cau
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
ma hoi » xa hoi, ma hoa, me hoi
xuc va » duc va, tuc va, luc va
sai ky » sac ky

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) or (sai ky)) tang ((ma hoi) OR (mai hoi)). hieu van cam xuc va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sai ky)) tang ((ma hoi) OR (mai hoi)). hieu van cam xuc va hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sai ky)) tang ((ma hoi) OR (mai hoi)). hieu van cam xuc va hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sai ky)) tang ((ma hoi) OR (mai hoi)). hieu van cam xuc va hanh vai cuu tre*.