Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van dinh » van minh, van dich, va dinh
va triet » va thiet, va trien, ve triet
va tinh » may tinh
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
su va » su van, tu va

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)) duc ((van dinh) or (va tinh)) su va 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)) duc ((van dinh) OR (va tinh)) su va triet.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ((ve cam) or (ve cac)) duc ((van dinh) or (va tinh)) su va triet*.