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
luc ban » duc ban, cuc ban, luc bat
va phan » van phan, va phat, va phap
sach ky » sac ky, sach y, sach ty
va nhan » van nhan, ca nhan, va nha
nang xa » nang x, lang xa, nang ma
su viet » so viet

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