帮忙 + 办事
The verb 办事 (bànshì) means "to handle affairs," "to get things done," or "to take care of business." It is a verb-object compound referring to the general act of dealing with tasks or errands. It often appears in descriptions of people who are efficient, reliable, or assigned to carry out duties.
他办事特别靠谱,交给他你放心。
tā bànshì tèbié kàopǔ, jiāo gěi tā nǐ fàngxīn.
He's very reliable at getting things done, you can rest easy leaving it to him.
我下午要去银行办事,晚点回来。
wǒ xiàwǔ yào qù yínháng bànshì, wǎndiǎn huílái.
I need to go to the bank this afternoon to take care of something, I'll be back later.
她办事效率很高,一天就搞定了。
tā bànshì xiàolǜ hěn gāo, yì tiān jiù gǎodìng le.
She's very efficient at getting things done, she finished it in one day.