Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
va kinh » va tinh, qua kinh
kinh cu » dinh cu, kinh co, dinh cuu
y nang » ly nang, v nang, may nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho
cu va » cuu va, tu va, su 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) OR (ky nang)) x hoi. hieu ((ve cam) or (ve cac)) duc va kinh cu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (ky nang)) x hoi. hieu ((ve cam) OR (ve cac)) duc va kinh cu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) OR (ky nang)) x hoi. hieu ((ve cam) or (ve cac)) duc va kinh cu va triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) OR (ky nang)) x hoi. hieu ((ve cam) or (ve cac)) duc va kinh cu va triet*.