Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
ty nang » ky nang, ty xang, ty hang
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
ma hoi » xa hoi, ma hoa, me hoi
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 ty nang ((ma hoi) OR (mai hoi)). ((hieu ve) or (hieu qua)) cam duc va hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((ma hoi) OR (mai hoi)). ((hieu ve) OR (hieu qua)) cam duc va hanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((ma hoi) OR (mai hoi)). ((hieu ve) or (hieu qua)) cam duc va hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((ma hoi) OR (mai hoi)). ((hieu ve) or (hieu qua)) cam duc va hanh vi va triet*.