Laravel 5 nested or and clause within another and clause

I want to run this query but with laravel query builder I'm not getting the exactly results using orWhere and where clause

SELECT * FROM lectures WHERE school=6 AND ( (period=3 AND class_section=3) OR (period=4 AND teacher=17) )

so how can I do it with laravel query builder can anyone help me out?

via Chebli Mohamed