Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va triet » va thiet, va trien, ve triet
bo sach » co sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
va hanh » van hanh, va thanh, va danh
hanh vu » hanh vi, hanh va, hanh tu
loc va » hoc va, luc va
vu va » vu van, tu va, su va

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: ((bo sach) OR (hoc sach)) ky tang xa hoi. hieu ((qua cac) OR (cua cac)) loc va hanh vu va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) OR (hoc sach)) ky tang xa hoi. hieu ((qua cac) or (cua cac)) loc va hanh vu va triet~".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) OR (hoc sach)) ky tang xa hoi. hieu ((qua cac) or (cua cac)) loc va hanh vu va triet*.