2 sentences

1. 别再为这件小事伤脑筋了。

   bié zài wèi zhè jiàn xiǎo shì shāng​nǎo​jīn le.

   Don't bother your head over such a trivial matter.

   Source: Dong Chinese Dictionary

2. 这个顽皮的孩子真让人伤脑筋。

   zhè​ge wán​pí de hái​zi zhēn ràng rén shāng​nǎo​jīn.

   This naughty child is a real handful.

   Source: Dong Chinese Dictionary