Perhaps you should try some spelling variations:
nang quan » ban quan, nang suat
quan hoi » quang hoi, quan doi, quan hai
ban hang » ngan hang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
xuc ban » duc ban, cuc ban, quoc ban
duy tre » duc tre, duy tri, duy tue
va duy » van duy, va du, ta duy

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 quan hoi. hieu ((van chat) or (cao chat)) xuc ban hang va duy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang quan hoi. hieu ((van chat) OR (cao chat)) xuc ban hang va duy tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang quan hoi. hieu ((van chat) or (cao chat)) xuc ban hang va duy tre*.