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
chat hoa » thuat hoa, chat va, chat huu
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
mat hoa » ma hoa, mai hoa, nhat hoa
ky dang » ky nang, ky danh
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 dang ((mat hoa) or (chat hoa)). hieu van ((ca da) OR (ca dan)) ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ((mat hoa) OR (chat hoa)). hieu van ((ca da) OR (ca dan)) ban thanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang ((mat hoa) or (chat hoa)). hieu van ((ca da) OR (ca dan)) ban thanh vai cua tre*".