Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
ky trong » ly trong, ke trong, cay trong
va triet » va thiet, va trien, ve triet
sy long » sy luong, quy long
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va hanh » van hanh, va thanh, va danh
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((sy long) or (ky trong)) xa hoi. hieu ve pham duc va hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((sy long) OR (ky trong)) xa hoi. hieu ve pham duc va hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((sy long) or (ky trong)) xa hoi. hieu ve pham duc va hanh vi va triet*.