Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang xay » dang van, van xay
thanh va » thanh van, hanh va, thanh ha
lang van » dang van, tang van, hoang van
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
lang xa » lang ha
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
cac lo » cac lop, cac co, cac bo
lo ban » co ban, lo van, ly ban
va cua » va chua, via cua, ca cua

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