A couple of things jump out at me. First, the capital "S" indicates that you want a pronominal suffix. Based on what you said you were searching for, I don't think you do. Also, the asterisk after the cohortative "C" will bring up hits classified as cohortative in meaning even if they are not cohortative in form, and I'm not sure if you want that. That said, I have no idea why those two hits are coming up in Psalms 3 and 10. You might try tweaking those two things, but I don't know that it will solve your problem.
καὶ ὑπὲρ πάντων ἀπέθανεν ἵνα οἱ ζῶντες μηκέτι ἑαυτοῖς ζῶσιν, ἀλλὰ τῷ ὑπὲρ αὐτῶν ἀποθανόντι καὶ ἐγερθέντι.