Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
hieu ca » hieu cac, hieu cua, hieu va
cuc ban » cua ban, cuu ban, duc ban
cac ban » cac dan, cac van, can ban
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 ca nhan ((cuc ban) OR (cac ban)) hanh vi ((va trien) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu ca nhan ((cuc ban) OR (cac ban)) hanh vi ((va trien) or (su triet))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ca nhan ((cuc ban) OR (cac ban)) hanh vi ((va trien) or (su triet))*.