Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
ha xuc » hoa xuc, ha duc, chat xuc
ma hoi » mai hoi, xa hoi, me hoi
lai va » loai va, mai va, dai va
van ha » van hoa, van chat, van phan

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 ty nang ((ma hoi) OR (ma hoa)). hieu van ha xuc ((ban hanh) or (van hanh)) lai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((ma hoi) OR (ma hoa)). hieu van ha xuc ((ban hanh) OR (van hanh)) lai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((ma hoi) OR (ma hoa)). hieu van ha xuc ((ban hanh) or (van hanh)) lai va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((ma hoi) OR (ma hoa)). hieu van ha xuc ((ban hanh) or (van hanh)) lai va triet*.