Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
cuu tre » cau tren, cau treo
duc van » duc va, duc tan, duc manh
cua tre » cua te, cua triet, dua tren
lam duc » lam duoc, pham duc, nam duoc
van lam » van nam
ky tang » ky dang, kho tang, ky trong
su sac » su sach, su cac, su xac

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

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