Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
van phan » van phong, luan phan, van ban
anh hanh » anh thanh, xanh hanh, anh anh
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
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: thu sach ky ((nang xa) OR (nang ma)) hoi. lieu ((van phan) or (van thanh)) duc anh hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (nang ma)) hoi. lieu ((van phan) OR (van thanh)) duc anh hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) OR (nang ma)) hoi. lieu ((van phan) or (van thanh)) duc anh hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) OR (nang ma)) hoi. lieu ((van phan) or (van thanh)) duc anh hanh dai cua tre*.