'deepened collaboration' is a correct and usable phrase in written English.
You can use it to describe a situation in which two or more people or groups have increased their level of cooperation. For example, "The school's newly established mentorship program has deepened collaboration between faculty and students."
We must broaden and deepen collaboration and consultation to achieve buy-in.
The steps — announced in three joint statements by the I.E.A. and the countries — focus on deepening collaboration in energy security, statistics, efficiency and emissions-reducing technology.
From missionary churches in Israel to Holy Land tourism, from the Israeli government to the American Jewish Committee, and from Billy Graham's influence on Richard Nixon to John Hagee's courting of Donald Trump, Hummel reveals modern Christian Zionism to be an evolving and deepening collaboration between Christians and the state of Israel.
The companies added "the three partners will further deepen collaboration on initiatives such as traffic sharing, media and advertising, resources sharing, membership benefits, payment and internet finance, big data, etc".
We must deepen collaboration between policy makers, law enforcement and the technology industry to embed principles of safety in the design of technology, and to work together to find solutions to keep pace with digital technology that can enable and conceal illegal trafficking and other online child sexual abuse.
We seek out and support important research conducted locally to deepen collaborations between our schools and critical research institutes across Brazil.
During IAP 2013, more than 50 students will be traveling to seven countries to work on D-Lab projects and to deepen collaborations with community partners.
"Ioannis's expertise in modeling has the potential to create and deepen collaborations across a range of fields.
She deepened her collaboration with Sellars, notably with a Donna Elvira in "Don Giovanni," in 1987, that turned a character who can seem a tiresome whine into a harrowing, haunted figure.
Even though the two countries have deepened their collaboration in a number of key areas — particularly in facilitating the NATO mission in Afghanistan — it seems that old habits of suspicion and recrimination die hard.
