Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
van thanh » ban thanh, van tuan
thai cua » than cua, tai cuc, tri cua
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, pham duc, nam duoc
cao duc » dao duc, cao suc, giao duc
lang xa » lang ha, dang xay, lang van
sac ky » cac ky

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

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