Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
lang van » dang van, tang van, hoang van
thanh va » thanh van, hanh va, thanh ha
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet
cac lo » cac lop, cac bo, cac ho
cac co » cac cong
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: thu sach ky ((lang xa) OR (lang van)) hoi. hieu ve ((cac lo) or (cac co)) ban thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang xa) OR (lang van)) hoi. hieu ve ((cac lo) OR (cac co)) ban thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((lang xa) OR (lang van)) hoi. hieu ve ((cac lo) or (cac co)) ban thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((lang xa) OR (lang van)) hoi. hieu ve ((cac lo) or (cac co)) ban thanh va cua tre*.