Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van dam
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet

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 nang ma hoa. hieu ((van cam) OR (van cau)) cua ban thanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoa. hieu ((van cam) OR (van cau)) cua ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoa. hieu ((van cam) OR (van cau)) cua ban thanh dai cua tre*.