This is what I did when decided to farm the last pieces I was missing.
- Went Pure Black Character Tendency (doesn't affect drop rate, but I was Black when I decided to farm).
- Went Pure Black World Tendency (Black World Tendency increases enemy damage and souls earned, and yields better item drops, most especially for Ore).
- Held Large Sword Of Searching in my Off-Hand while killing the mobs that droped my items.
Here's more information on the Large Sword Of Searching from the Demon's Souls Wiki.
http://demonssouls.wikidot.com/large-sword-of-searching
At some point, something must have come from nothing...
...nothing can come from nothing...