Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang xay » dang van, van xay
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
tuc ban » thuc ban, truc ban, tu ban
cac tuc » cac toc, cac tu, cac tac
van cac » van hac, van cau, van bac
sach ky » sac ky, sach y, sach ty
lang ha » long ha
lang xa » lang van
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((((lang xa) OR (lang ha))) or (dang xay)) hoi. hieu van cac tuc ban thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((((lang xa) OR (lang ha))) OR (dang xay)) hoi. hieu van cac tuc ban thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((((lang xa) OR (lang ha))) or (dang xay)) hoi. hieu van cac tuc ban thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((((lang xa) OR (lang ha))) or (dang xay)) hoi. hieu van cac tuc ban thanh vi cua tre*.