Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
thi lan » thi hanh, thi nang, thi lien
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
nam xuc » cam xuc, nam xua, nam thuc
thi van » thi hanh, thi nang
xay hoi » xa hoi, tay hoi, cay phoi
so dung » su dung, hoc dung, noi dung
so dang » su dang, so dan, xo dang
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 ((so dang) OR (so dung)) xay hoi. ((thi van) or (thi lan)) nam xuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((so dang) OR (so dung)) xay hoi. ((thi van) OR (thi lan)) nam xuc van hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((so dang) OR (so dung)) xay hoi. ((thi van) or (thi lan)) nam xuc van hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((so dang) OR (so dung)) xay hoi. ((thi van) or (thi lan)) nam xuc van hanh di cua tre*.