Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cac xuc » cac nuoc, chat xuc, cac cuoc
va danh » va dinh, va dan, va hanh
ma hoi » mai hoi, xa hoi, ma hoa
co cua » con cua, cong cua, cuoi 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 ky nang ma hoi. hieu va ((cac xuc) OR (cam xuc)) va danh ((co cua) OR (ca cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu va ((cac xuc) or (cam xuc)) va danh ((co cua) OR (ca cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu va ((cac xuc) or (cam xuc)) va danh ((co cua) OR (ca cua)) tre*.