Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
vai cua » dai cua, hai cua, lai cua
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 ty xang xa hoi. ((hieu qua) or (hieu quan)) cam ((xuc va) or (tuc va)) hanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang xa hoi. ((hieu qua) OR (hieu quan)) cam ((xuc va) OR (tuc va)) hanh vai cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang xa hoi. ((hieu qua) or (hieu quan)) cam ((xuc va) or (tuc va)) hanh vai cua vat*.