Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
xa hanh » xa thanh, xa khanh, va hanh
cam tuc » cam tu, nam thuc, dam thuc
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang

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 ky tang xa hoi. hieu va ((cam tuc) OR (cam xuc)) xa hanh ((vai cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky tang xa hoi. hieu va ((cam tuc) OR (cam xuc)) xa hanh ((vai cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky tang xa hoi. hieu va ((cam tuc) OR (cam xuc)) xa hanh ((vai cua) or (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang xa hoi. hieu va ((cam tuc) OR (cam xuc)) xa hanh ((vai cua) or (lai cua)) tre*.