Perhaps you should try some spelling variations:
tai nhanh » tai thanh, thai thanh, tai chinh
va triet » va thiet, va trien, ve triet
tai hanh » tai thanh, thi hanh, tai anh
hanh nam » thanh nam, hanh lam, hanh ngay
van hanh » van thanh, ban hanh, van anh
tuc van » thuc van, truc van, tuc va
tu sach » thu sach, su sach, te sach
va cam » va cham, va cac, va cao
ve cai » va cai, ve cac, ve tai

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

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