Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
ban hang » ngan hang
qua nhat » qua hoat, luc nhat, qua hai
nhat luc » nhan luc, nhat nuoc, nhat cua
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
luc ban » duc ban, cuc ban, luc bat
hang vi » hang va, hanh vi, hang di
nang xa » lang xa, nang ma, mang xa

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 ((nang xa) or (nang x)) hoi. hieu qua nhat luc ban hang vi ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (nang x)) hoi. hieu qua nhat luc ban hang vi ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (nang x)) hoi. hieu qua nhat luc ban hang vi ((va triet) or (su triet))*.