漢字制限
かんじせいげん restrictions on the number of kanji recognized for usage

漢字制限論
かんじせいげんろん the question of limiting the use of Chinese characters

漢字変換
かんじへんかん kanji conversion

漢字文化
かんじぶんか (the so-called) kanji culture

漢字文化圏
かんじぶんかけん countries which use Chinese characters