Compounds of 苦心

• 苦心
  (n,vs) pain
  trouble
  anxiety
  diligence
  hard work
  (P)
• 苦心談
  (n) account of the hardships one has encountered
• 苦心惨憺
  (n,vs) taking great pains
• 苦心を買われる
  (exp) to have one's labor appreciated (labour)