Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
tai cua » thai cua, tai cuc, tri cua
sach ky » sach y, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ha tuc » ha thuc, va tuc, thai tuc
ha duc » ho duc, ha dac, xa duc
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) lang xa hoi. hieu van ((ha tuc) OR (ha duc)) van thanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) lang xa hoi. hieu van ((ha tuc) or (ha duc)) van thanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) lang xa hoi. hieu van ((ha tuc) or (ha duc)) van thanh tai cua tre*.