Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
va triet » va thiet, va trien, ve triet
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
luc ban » duc ban, cuc ban, luc bat
hang vi » hang va, hanh vi, hang di

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 hoi. ((hieu va) or (hieu qua)) nang 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 hoi. ((hieu va) OR (hieu qua)) nang luc ban hang vi ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu va) or (hieu qua)) nang luc ban hang vi ((va triet) or (su triet))*.