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
su sach » so sach, vu sach
van cua » vang cua, ban cua, dan cua
ca danm » ca dam, cao dang, cua dang
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, sang tao
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: su sach ky ((sang ma) or (mang may)) hoa. hieu van ((ca dan) or (ca danm)) ban thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((sang ma) OR (mang may)) hoa. hieu van ((ca dan) OR (ca danm)) ban thanh van cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((sang ma) or (mang may)) hoa. hieu van ((ca dan) or (ca danm)) ban thanh van cua tre*.