Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va phan » van phan, va phat, hoa phan
va phap » va phat, ban phap
luc ban » duc ban, cuc ban, luc bat
hang vi » hang va, hanh vi, hang di
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 phan) or (va phap)) luc ban hang vi ((va thiet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ((va phan) OR (va phap)) luc ban hang vi ((va thiet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ((va phan) or (va phap)) luc ban hang vi ((va thiet) or (su viet))*.