Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
hieu ve » hieu van
sang ma » tang ma, nang ma, sang tao
ty sang » ty xang, ty hang, duy sang
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
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: ((su sach) OR (vu sach)) ty sang ma hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty sang ma hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ty sang ma hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ty sang ma hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vai cua tre*.