Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach kem » hanh kem
thanh te » thanh ve, thanh de, thanh le
nhan luc » nang luc
hieu van » hieu va, thien van, lieu va
hau luc » hau loc, cau luc, hieu luc
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
te cua » tue cua, le cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach kem) or (sac ky)) nang xa hoi. hieu van ((hau luc) or (nhan luc)) van thanh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach kem) OR (sac ky)) nang xa hoi. hieu van ((hau luc) OR (nhan luc)) van thanh te cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach kem) or (sac ky)) nang xa hoi. hieu van ((hau luc) or (nhan luc)) van thanh te cua tre*.