Perhaps you should try some spelling variations:
ve triet » va trien
su triet » su viet, su tien
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
v nang » va nang, vu nang, van nang
ve cam » ve cham, ve cac, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((2 nang) OR (v nang)) xa hoi. hieu ve cam duc van hanh vi ((su triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((2 nang) or (v nang)) xa hoi. hieu ve cam duc van hanh vi ((su triet) OR (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((2 nang) or (v nang)) xa hoi. hieu ve cam duc van hanh vi ((su triet) OR (ve triet))*.