Perhaps you should try some spelling variations:
sach kho » bach khoa, sach dao, sach nha
kho tang » cao tang
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
mai khoi » mai khoa, tai khoa, cac khoi
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
mai hoi » dai hoi, lai hoi, mai doi
xu ban » xuc ban, tu ban, vu ban
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach kho tang ((mai hoi) or (mai khoi)). ((hieu ve) or (hieu van)) chao xu ban hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach kho tang ((mai hoi) OR (mai khoi)). ((hieu ve) OR (hieu van)) chao xu ban hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach kho tang ((mai hoi) or (mai khoi)). ((hieu ve) or (hieu van)) chao xu ban hanh vi cua te*.