[jì shàng xīn lái]   

计    上    心    来    计：计策、计谋。心里突然有了计策。 褒义>

计上心来，汉语词目。释义：计：计策、计谋；心里突然有了计策。注音：jì shàng xīn lái

A stratagem comes to mind

计无所施    计无所出    计较锱铢    计穷力尽    计划精巧