1991 Isuzu Rodeo Question clutch issues

Trying figure out how in the world to bleed my clutch on a 1991 Rodeo. I replaced the slave cylinder, tried bleeding it at the slave cylinder and the intermediate bleeder valve on the side wall of the engine compartment, by opening the slave cylinder bleed valve, depressing clutch pedal, closing bleeder valve, pulling the clutch pedal back up. After doing this 400-500 times, no progress. I bought a vacuum/bleed system and hooked it up to the slave cylinder bleed valve and while system was fully closed, pumed up the vacuum, then opened the blleder slowly. After several times doing this, no results but a tired hand. Anybody have suggestions please? This has baffled me as to how hard this is. Thanks!