Perhaps you should try some spelling variations:
thanh giau » thanh gian, thanh giang, thanh lieu
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
giau cua » gian cua, gia cua, dieu cua
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
cac co » cac cong
cac lo » cac lop, cac bo, cac ho

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 x)) hoi. hieu ve ((cac lo) OR (cac co)) van thanh giau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (nang x)) hoi. hieu ve ((cac lo) OR (cac co)) van thanh giau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) or (nang x)) hoi. hieu ve ((cac lo) OR (cac co)) van thanh giau cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (nang x)) hoi. hieu ve ((cac lo) OR (cac co)) van thanh giau cua tre*.