Perhaps you should try some spelling variations:
ban hang » ngan hang
hang tri » hang tai, lang tri, nang tri
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van lam, van cau, van dam
xuc ban » duc ban, cuc ban, quoc ban
cua su » qua su

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

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