Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van nhan » van phan, van thanh, danh nhan
va triet » va thiet, va trien, ve triet
ban hang » ngan hang
va phan » van phan, va phat, va phap
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 » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. hieu ((van nhan) or (va phan)) luc ban hang vi ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((van nhan) OR (va phan)) luc ban hang vi ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((van nhan) or (va phan)) luc ban hang vi ((va triet) or (su triet))*.