Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
ky tang » ky dang, kho tang, ky trong
lam duc » lam duoc, pham duc, nam duoc
da duoc » tao duoc, hoa duoc
cua tre » cua te, cuu tre, cua triet
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ((ky tang) or (ky nang)) xa hoi. hieu van ((lam duc) or (da duoc)) van thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ((ky tang) OR (ky nang)) xa hoi. hieu van ((lam duc) OR (da duoc)) van thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su xac ((ky tang) or (ky nang)) xa hoi. hieu van ((lam duc) or (da duoc)) van thanh dai cua tre*.