The phrase "substantive challenges" is correct and can be used in written English.
It is commonly used in formal or academic writing to refer to significant or important obstacles or difficulties. Example: "The project faced several substantive challenges, including limited funding and a lack of support from key stakeholders."
"Substantive challenges remain".
They are home to some of his biggest political and substantive challenges, including a depressed economy, a disenchanted middle class and a disdain for government highlighted by the Tea Party movement.
Definitions, classification, and documentation are substantive challenges to comprehensive event capture.
As a key component of Iran's urban policy and planning, new town development has been scrutinised from various aspects such as design and architecture, geography, and sociology, with much of the literature concentrating on the substantive challenges of the development process.
So I would say with the substantive challenges, the things I learned about the police department that needed to be changed or fixed was largely through the prism of these community groups, who were very prepared and came to us to present their lists of concerns.
This is particularly true for many long-lived species, such as conifers, but whose long generation times pose substantive challenges, including increased recalcitrance for SE as plants age.
The government's main problem, though, the substantive challenge, is the many complications associated with going there.
The party could avoid the national embarrassment of a Paladino candidacy and mount a substantive challenge to the Democratic nominee, Andrew Cuomo.
It's by no means bulletproof; there are lots of moving parts to these arguments, and the fact that we've had debt bubbles in periods of low inequality is a substantive challenge to their hypothesis.
Kay Redfield Jamison Washington Daphne Merkin replies: Kay Jamison's insultingly reductionist characterization of both my work and my life in no way offers a substantive challenge to what was a thoughtful, if critical, review.
At least this is true if embodied cognition is to mark a significant departure from, and pose a substantive challenge to, traditional cognitive science and associated philosophical views of the mind.
