Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, cam tu, nam thuc
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va
sach ty » sach y, sach tu, xach tay
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) xang xa hoi. ((hieu ve) OR (hieu van)) cam tuc va hanh va cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach thu)) xang xa hoi. ((hieu ve) OR (hieu van)) cam tuc va hanh va cua vat~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) xang xa hoi. ((hieu ve) OR (hieu van)) cam tuc va hanh va cua vat*.