Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh di » thanh doi, thanh de, thanh do
so sach » so sanh, bo sach, co sach
tuc ban » thuc ban, truc ban, tu ban
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach ly » sach y, sach lo, sach ty
mang xa » mang may, dang xay, mang cua
nang xa » nang x, nang ma, ang xa
su viet » so viet
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ly ((((nang xa) or (mang xa))) or (lang xa)) hoi. hieu va cac tuc ban thanh di su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly ((((nang xa) OR (mang xa))) OR (lang xa)) hoi. hieu va cac tuc ban thanh di su viet.
• Adding a wildcard symbol may retrieve word variants: so sach ly ((((nang xa) or (mang xa))) or (lang xa)) hoi. hieu va cac tuc ban thanh di su viet*.