Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
duc danh » duc anh, duc hanh, duc dan
duc manh » suc manh, duc anh, duc minh
gian cua » gian xu, ban cua
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
via cua » gia cua, giau cua, rija cua
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu va cac ((duc danh) OR (duc manh)) thanh ((via cua) OR (gian cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu va cac ((duc danh) OR (duc manh)) thanh ((via cua) or (gian cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu va cac ((duc danh) OR (duc manh)) thanh ((via cua) or (gian cua)) tre*.