Bing found the following results
Mainland China - Wikipedia
China | Events, People, Dates, Flag, Map, & Facts | Britannica
China - World Factbook Glyph
What is the difference between China and mainland China?
China - Wikipedia
China country profile - BBC News
Mainland China - Simple English Wikipedia, the free encyclopedia
Mainland China - WikiMili, The Best Wikipedia Reader
Mainland China - Wikiwand
China - New World Encyclopedia