Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
su triet » su viet, su tien, ve triet
va nhan » van nhan, ca nhan, va nha
sach ky » sac ky, sach y, sach ty
luc ban » duc ban, cuc ban, luc bat
va phan » van phan, va phat, va phap
x hoi » xa hoi, o hoi, x ho

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