Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su triet » su tien, ve triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
su viet » so viet
va dau » va dao
xuc va » tuc va, luc va, xac va
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 dau ((xuc va) OR (duc va)) hanh vi ((su triet) OR (su viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu va dau ((xuc va) or (duc va)) hanh vi ((su triet) OR (su viet))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu va dau ((xuc va) or (duc va)) hanh vi ((su triet) OR (su viet))*.