database - how to get Intersection of two query in mysql -

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i have table has 2 column 2 foreign key 2 different table.

this relation table:

table

i want select student can speak both language id 3 , 4.

how can wrote query give me e.x 12 , 14

assume relation named "my-relation":

 select r1.student_id my-relation r1 join my-relation r2 on r1.student_id = r2.student_id r1.language_id = '3' , r2.language_id = '4'

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