Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hoang van » hang va
thanh soc » thanh son, nhanh soc, thanh hoc
hieu ban » hieu van, dieu ban, lieu ban
lang van » dang van, tang van, giang van
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
dan ky » van ky
soc va » hoc va, loc va, doc va
te dan » te danh, tre dan, ke dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: te dan ky ((lang van) OR (hoang van)) hoi. hieu ban thanh soc va hanh vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te dan ky ((lang van) OR (hoang van)) hoi. hieu ban thanh soc va hanh vi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te dan ky ((lang van) OR (hoang van)) hoi. hieu ban thanh soc va hanh vi ((cuu tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te dan ky ((lang van) OR (hoang van)) hoi. hieu ban thanh soc va hanh vi ((cuu tre) or (cua tre))*.