Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
ma hoi » xa hoi, ma hoa, me hoi

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 sang ((ma hoi) OR (mai hoi)). ((hieu ve) OR (hieu va)) cam xuc va danh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ((ma hoi) OR (mai hoi)). ((hieu ve) OR (hieu va)) cam xuc va danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ((ma hoi) OR (mai hoi)). ((hieu ve) OR (hieu va)) cam xuc va danh vai cua tre*.