Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
ca dua » cay dua, ca cua, ca da
ca dan » cac dan, ca dao

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 dang ma hoa. hieu van ((ca dua) or (ca dan)) ban thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ma hoa. hieu van ((ca dua) OR (ca dan)) ban thanh van cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang ma hoa. hieu van ((ca dua) or (ca dan)) ban thanh van cua tre*.