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

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) or (sach ty)) dang ma hoa. hieu van ((ca da) OR (ca dan)) ban thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) dang ma hoa. hieu van ((ca da) OR (ca dan)) ban thanh van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) dang ma hoa. hieu van ((ca da) OR (ca dan)) ban thanh van cua tre*".