trying to make someone believe
彼は彼らに自分の無実を信じさせようとしたが無駄だった。
He tried in vain to convince them of his innocence.
彼にそのことを信じさせようとしても無駄だ。
It's no use trying to make him believe that.
私は彼に私の潔白を信じさせようと努めた。
I tried to convince him of my innocence.