Perhaps you should try some spelling variations:
van thanh » ban thanh
thu sach » tu sach, thuat sach, thuoc sach
van tuan » van quan, van ban, anh tuan
lieu cua » dieu cua, bieu cua, hieu cua
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
van hau » van ha, van hai, van dau
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 x ho. hieu ((van cac) or (van hau)) duc ((van thanh) OR (van tuan)) lieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x ho. hieu ((van cac) OR (van hau)) duc ((van thanh) OR (van tuan)) lieu cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x ho. hieu ((van cac) or (van hau)) duc ((van thanh) OR (van tuan)) lieu cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x ho. hieu ((van cac) or (van hau)) duc ((van thanh) OR (van tuan)) lieu cua tre*.