Perhaps you should try some spelling variations:
ban hanh » ban hang
tham duc » pham duc, tham du, than duc
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
lang xa » lang ha, dang xay
duc ban » duc tan, duc van, dua ban
su dang » su dung
dang y » dang xay
vi su » ve su, ki su, oi su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su dang y ((lang xa) or (lang van)) hoi. hieu van tham duc ban hanh ((vi su) OR (va su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dang y ((lang xa) OR (lang van)) hoi. hieu van tham duc ban hanh ((vi su) OR (va su)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su dang y ((lang xa) or (lang van)) hoi. hieu van tham duc ban hanh ((vi su) OR (va su)) triet*".