Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
y hang » ly hang, ty hang, yu hang
va hoi » xa hoi, va hoc, va 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: thu sach y hang va hoi. ((hieu qua) or (hieu quan)) cam xuc va hanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y hang va hoi. ((hieu qua) OR (hieu quan)) cam xuc va hanh vai cua vat.
• Adding a wildcard symbol may retrieve word variants: thu sach y hang va hoi. ((hieu qua) or (hieu quan)) cam xuc va hanh vai cua vat*.