Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
doc sach » hoc sach, toc sach, nuoc sach
su triet » su viet, su tien, ve triet
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v 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: doc sach y nang ((xa hoi) OR (mai hoi)). hieu ve cam duc va hanh vi ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach y nang ((xa hoi) or (mai hoi)). hieu ve cam duc va hanh vi ((cua triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: doc sach y nang ((xa hoi) or (mai hoi)). hieu ve cam duc va hanh vi ((cua triet) OR (su triet))*.