The phrase "jointly help" is correct and usable in written English.
You can use it when you are referring to the effort of multiple people working together to help someone or something. For example: "They jointly helped their friend move to a new apartment."
[C6.] Ford Teams With Sierra Club to Promote Hybrid Vehicle Ford and the Sierra Club said they would jointly help promote the company's second hybrid vehicle, a version of its Mercury Mariner sport utility vehicle that went on sale this week, and will be sold almost exclusively online.
This indirect neighbor discovery and selective feedback policies jointly help our algorithm to decrease the collisions in the network.
And in today's numerous "single mom" households, making sure that this continues is one way in which we can, jointly, help save the planet.
Motorola stole the limelight away from LG when the two companies jointly helped Google announce Android Wear.
As we know from Snowden's revelations, the company has shared outside contracts with the NSA, and the two have jointly helped to prosecute the drug war in Latin America.
Mixing the two fun and informative tweets jointly helps keep your readers keep fascinated with the tweets.Be mindful when you utilize the help of advertising and marketing firms who specialize in social media.
Artur Mas, president of the Catalonian regional government, suggested Friday that regions should be allowed to issue bonds jointly to help reduce their financing cost.
International Business Machines and Ericsson A.B. of Sweden agreed yesterday to sell products jointly to help banks provide advanced wireless services, including mobile trading and payments.
Working jointly will also help you identify areas where you disagree, which may help avoid arguments later.
The Rigases and Adelphia intended to repay the billions of dollars they jointly borrowed to help the company upgrade its physical plant, Mr. Fleming said.
"The data that we jointly generate will help us understand essential biological information on human cell differentiation," Thomas Okarma, Geron's chief executive, said.
