Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
tang ma » mang may, tang van
sang ma » nang ma, sang tao, mang may
cua tre » cua te, cuu tre, cua triet
van ca » van cau, van cua, dan ca
ca dua » cay dua, ca cua, ca da
sac ky » cac ky, sai ky

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