Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
cam tuc » cam tu, nam thuc, dam thuc
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
ma hoi » xa hoi, ma hoa, me hoi
vai va » mai va, dai va, hai 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 y nang ((ma hoi) OR (mai hoi)). hieu va ((cam tuc) or (cam xuc)) va hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((ma hoi) OR (mai hoi)). hieu va ((cam tuc) OR (cam xuc)) va hanh vai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((ma hoi) OR (mai hoi)). hieu va ((cam tuc) or (cam xuc)) va hanh vai va triet*".