Perhaps you should try some spelling variations:
hoang van » hang va
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
lang van » dang van, tang van, giang van
tham soc » cham soc, tham nuoc, thai son
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
ban ky » van ky, dan ky
soc va » hoc va, loc va, doc va
te ban » te bao

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

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