Problem

問

Ask, Inquire, Problem, Question

難

Complex, Difficult, Disastrous, Hard, Not, Prefix, Problem, Problematic, Rebuke, Reprimand, Suffer

問題

A, Concern, Concerns, Problem, Problems, Question, Questions, The

疑難

Problem, Puzzle, Question

難題

Challenge, Problem, Puzzle

麻煩

Annoyed, Bother, Hassle, Hassles, Make, Problem, Problems

出難題

Problem

的問題

Problem, Problems, Question, Questions, The