Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dieu cua » dieu tra
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
nhan luc » nang luc
hieu cua » hieu qua, bieu cua, hieu ca
su triet » su viet, su tien, ve triet
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.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang xa hoi. ((hieu cua) OR (dieu cua)) nhan luc ban hanh vi ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. ((hieu cua) OR (dieu 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 cua) OR (dieu 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 cua) OR (dieu cua)) nhan luc ban hanh vi ((va triet) or (su triet))*.