百花齐放，百家争鸣

bǎi huā qí fàng , bǎi jiā zhēng míngbaihuaqifang,baijiazhengming

1. a hundred flowers bloom, a hundred schools of thought contend (idiom); refers to the classical philosophic schools of the Warring States period 475-221 BC, but adopted for Mao's campaign of 1956

Study it in Yanamino