Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nam xuc » cam xuc, nam xua, nam thuc
nam qua » nam quan, nam cua, nam mua
thi van » thi lan, thi hanh, thi nang
xay hoi » tay hoi, cay phoi, gay thoi
cua tre » cua te, cuu tre, cua triet
sach o » sach lo, sac o, sach y
o dang » xo dang, do dang, so dang
vi cua » vai cua, di 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: thu sach o dang ((xay hoi) OR (xa hoi)). thi van ((nam xuc) OR (nam qua)) van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach o dang ((xay hoi) OR (xa hoi)). thi van ((nam xuc) or (nam qua)) van hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach o dang ((xay hoi) OR (xa hoi)). thi van ((nam xuc) or (nam qua)) van hanh vi cua tre*.