Perhaps you should try some spelling variations:
thu hang » thi hang, thuc hanh, thu huong
lang van » dang van, tang van, hoang van
ban hanh » ban hang
pham duy » pham duc
va triet » va thiet, va trien, ve triet
hang ky » hong ky, hanh ky, dang ky
vu pham » su pham, vi pham, vu kham
lang xa » lang ha, dang xay
duy ban » uy ban, duy van, duy can
su viet » so viet
hieu vu » hieu va, hieu ve, hieu su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu hang ky ((lang xa) or (lang van)) hoi. hieu vu pham duy ban hanh vi ((su viet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu hang ky ((lang xa) OR (lang van)) hoi. hieu vu pham duy ban hanh vi ((su viet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: thu hang ky ((lang xa) or (lang van)) hoi. hieu vu pham duy ban hanh vi ((su viet) or (va triet))*.