Chick Publications
Right now, they have Chinese and Chinese Simple. It means they have Chinese Traditional and Chinese Simplified.
Christian Tract Ministry
http://christiantractministry.org/lang/jpn
https://christiantractministry.org/lang/chi
http://christiantractministry.org
Some of these are evangelistic tracts and some are evangelistic booklets.
Four Spiritual Laws
Power to Change
https://store.powertochange.org/
Please put the word Chinese in the search engine.
World Christian Tract Finder
Please click on Language and then C and then choose Chinese.
You may look for Cantonese and other Chinese languages.
World Missionary Press
https://www.wmpress.org/read-booklet/languages-produced/
WMP has Chinese Simplified and Chinese Traditional. They might have other languages of China.