Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
su triet » su viet, su tien, ve triet
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
vi su » va su, ve su, ki su

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: toc sach y nang ((xa hoi) OR (mai hoi)). hieu ve cam xuc va hanh vi su triet~.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((xa hoi) or (mai hoi)). hieu ve cam xuc va hanh vi su triet*.