Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
thu dang » thu hang, thu bang, thu dong
tuc ban » thuc ban, truc ban, tu ban
ve cham » va cham, ve chat, vu cham
su sach » so sach, vu sach
tu dang » tu dong, su dang, vu dang
ve cac » va cac, vien cac
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((tu dang) OR (thu dang)) xa hoi. hieu ((ve cac) or (ve cham)) tuc ban hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu dang) OR (thu dang)) xa hoi. hieu ((ve cac) OR (ve cham)) tuc ban hanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tu dang) OR (thu dang)) xa hoi. hieu ((ve cac) or (ve cham)) tuc ban hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((tu dang) OR (thu dang)) xa hoi. hieu ((ve cac) or (ve cham)) tuc ban hanh vi va triet*.