Perhaps you should try some spelling variations:
cham giua » tham gia, nhat giua, cam gia
ve triet » va trien, su triet
ban hanh » ban hang
dang xay » van xay
dang van » hoang van, hang va
cham dua » chay dua, pham duc, pham duy
su dang » su dung
dang ky » dang y, dan ky, dong ky
hieu ve » hieu va, hieu van
vi ve » va ve, gi ve, ve ve

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 ky ((dang xay) or (dang van)) hoi. hieu ve ((cham dua) OR (cham giua)) ban hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dang ky ((dang xay) OR (dang van)) hoi. hieu ve ((cham dua) OR (cham giua)) ban hanh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su dang ky ((dang xay) or (dang van)) hoi. hieu ve ((cham dua) OR (cham giua)) ban hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: su dang ky ((dang xay) or (dang van)) hoi. hieu ve ((cham dua) OR (cham giua)) ban hanh vi ve triet*.