2 sentences for 不到 (bù​dào — insufficient)

1. 水和油混不到一块儿。

   shuǐ hé yóu hùn bù​dào yī​kuài​r.

   Oil and water don't mix.

   Source: Dong Chinese Dictionary

2. 因为精力有限，他难免有照顾不到的地方。

   yīn​wèi jīng​lì yǒu​xiàn, tā nán​miǎn yǒu zhào​gu bù​dào de dì​fang.

   With his limited energy, it's inevitable that some things will be overlooked.

   Source: Dong Chinese Dictionary