Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
ty ang » ty xang, ty hang, ty anh
ang xa » lang xa, mang xa, dang xay
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 ang xa hoi. ((hieu va) or (hieu van)) 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 ang xa hoi. ((hieu va) OR (hieu van)) cam ((xuc va) OR (tuc va)) hanh vai cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ang xa hoi. ((hieu va) or (hieu van)) cam ((xuc va) or (tuc va)) hanh vai cua vat*.