Can you help me look for my umbrella有错误吗？

no mistakes
help sb do sth.
也可说 help sb with sth.

Can you help me looking for my unbrella?这样好像感觉比较对

can you help me for my unbrella.感觉应该是这样咯。。。

没有错误！加不加to都对！

符合语法结构

right