Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
sach ty » sach y, sach tu, sach thu
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
nang co » nang cao, nang doc, nang noi
ty nang » ky nang, ty xang, ty hang
ve cac » vien cac
co hoi » co hoc, co loi
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 ty nang co hoi. hieu ((ve cac) OR (va cac)) ((xuc ban) OR (duc manh)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang co hoi. hieu ((ve cac) OR (va cac)) ((xuc ban) or (duc manh)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang co hoi. hieu ((ve cac) OR (va cac)) ((xuc ban) or (duc manh)) hanh vi cua tre*.