Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su triet » su viet, su tien, ve triet
vien da » vien dai, hien dai
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. hieu ((ve cam) or (((ve cac) or (vien da)))) duc va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu ((ve cam) OR (((ve cac) OR (vien da)))) duc va hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ((ve cam) or (((ve cac) or (vien da)))) duc va hanh vi su triet*.