4 sentences

1. 不要在背后玩弄这种卑劣的手腕。

   bù yào zài bèi​hòu wán​nòng zhèi zhǒng bēi​liè de shǒu​wàn.

   Don't resort to such despicable tricks behind people's backs.

   Source: Dong Chinese Dictionary

2. 他最擅长在背后玩弄权术和政治阴谋。

   tā zuì shàn​cháng zài bèi​hòu wán​nòng quán​shù hé zhèng​zhì yīn​móu.

   He is best at manipulating power and political intrigue behind the scenes.

   Source: Dong Chinese Dictionary

3. 他只是在玩弄她的感情，并不是真心爱她。

   tā zhǐ​shì zài wán​nòng tā de gǎn​qíng, bìng bù shì zhēn​xīn ài tā.

   He was just playing with her feelings; he didn't truly love her.

   Source: Dong Chinese Dictionary

4. 他坐在桌边，漫不经心地玩弄着手里的打火机。

   tā zuò zài zhuō biān, màn​bù​jīng​xīn de wán​nòng zhe shǒu lǐ de dǎ​huǒ​jī.

   He sat at the table, idly fiddling with the lighter in his hand.

   Source: Dong Chinese Dictionary