Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu cua » hieu qua, dieu cua, bieu cua
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
nhan luc » nang luc
su triet » su viet, su tien, ve triet
hieu ca » hieu cac, hieu va, hieu xa
sach ty » sach y, sach tu, sach thu
luc ban » duc ban, cuc ban, luc bat
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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 ty nang xa hoi. ((hieu ca) OR (hieu cua)) nhan luc ban hanh vi ((va triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang xa hoi. ((hieu ca) OR (hieu cua)) nhan luc ban hanh vi ((va triet) or (su triet))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. ((hieu ca) OR (hieu cua)) nhan luc ban hanh vi ((va triet) or (su triet))*.