ARPT VEHICLE DOES NOT COMPLY WITH PHL TWR INSTRUCTIONS AND CROSSES RWY WITH ACFT ON 1 MI FINAL.

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WORKING LCL CTL AT PHL TWR; 4 ACTIVE RWYS. PREVIOUS DEP RPTED METAL DEBRIS ON RWY 35. ARPT VEHICLE RESPONDED AND REMOVED A DEAD BIRD. AT THE SAME TIME; A KING AIR DEP RPTS A DEAD BIRD AT THE APCH END OF RWY 27R. ARPT VEHICLE FINISHED REMOVING THE FIRST BIRD AND PROCEEDS TO RWY 27R. I INSTRUCTED THE VEHICLE TO THE APCH END OF RWY 27R; BUT; 'REMAIN CLR OF RWY 35 AT ALL TIMES.' (RWY 35 INTERSECTS RWY 27R; 3000 FT W OF RWY 27R APCH.) VEHICLE REPLIES 'ROGER.' ABOUT 3 MINS LATER I SEE THE VEHICLE CROSS RWY 35 WITH AN ACFT ON A 1 MI FINAL. I UNDERSTAND ALL RWY HOLD SHORT INSTRUCTIONS REQUIRE A READBACK; BUT THE VEHICLE WAS ONLY CLRED ONTO THE APCH END OF RWY 27R TO REMOVE THE DEAD BIRD. THERE WAS NO REQUEST FOR ADDITIONAL RWY INSPECTION. WHEN I CLRED THE VEHICLE ON RWY 35 FOR THE FIRST BIRD; I DIDN'T SAY HOLD SHORT OF RWY 27R BECAUSE HE WAS TO GO TO A VERY SPECIFIC PLACE ON THE RWY. SO THE QUESTION IS; DO I NEED TO GIVE AND RECEIVE A HOLD SHORT INSTRUCTION WHEN THE VEHICLE IS GIVEN A SPECIFIC CLRNC FOR A SPECIFIC DUTY.