3 sentences

1. 他是故意来找茬捣乱的，别理他。

   tā shì gù​yì lái zhǎo​chá dǎo​luàn de, bié lǐ tā.

   He's just here to pick a fight and cause trouble; ignore him.

   Source: Dong Chinese Dictionary

2. 他总是故意找茬，让大家很不开心。

   tā zǒng​shì gù​yì zhǎo​chá, ràng dà​jiā hěn bù kāi​xīn.

   He is always picking a fight, which makes everyone unhappy.

   Source: Dong Chinese Dictionary

3. 这个找茬游戏非常考验观察力。

   zhè gè zhǎo​chá yóu​xì fēi​cháng kǎo​yàn guān​chá​lì.

   This 'spot the difference' game is a real test of observation.

   Source: Dong Chinese Dictionary