Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
thiet » thieu

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 (ma hoa)). hieu ve cam tuc va hanh vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((ma hoi) OR (ma hoa)). hieu ve cam tuc va hanh vai ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((ma hoi) OR (ma hoa)). hieu ve cam tuc va hanh vai ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((ma hoi) OR (ma hoa)). hieu ve cam tuc va hanh vai ((va triet) or (va thiet))*.