"in-depth writing" is correct and usable in written English.
You can use it to refer to research or an analysis of a subject that goes beyond a brief overview. For example, "My paper will provide an in-depth writing on the history of the American Civil War."
There's been a dearth of in-depth writing from the Philippines since Rodrigo Duterte became president in June.
The camps provide in-depth writing instruction, extended periods of writing time, flexibility in writing projects, and daily time to share writing with peers.
The lay-offs immediately reinvigorated doubts about Grantland, which had developed a loyal but relatively small following for its in-depth writing, commitment to quirkiness and talent, and wide range: film, television, music in their own rights and nearly every sport played in the US and abroad.
Looking to expand her gift of writing, Shannon completed a two-year, in-depth writing course through the Christian Writers Guild.
Longform [iPad] If the short blog posts and status updates found on Flipboard aren't quite quenching your intellectual thirst, you can dive into some read more in-depth writing with this curated app, appropriately called Longform.
Since the group gained international attention following its rapid seizure of territory in Syria and Iraq in mid-2014, journandsts analystsysts have produced a huge amount of excellent, in-depth writing about it.
After being preselected, finalists went through a rigorous application process, which included an in-depth written component and a Skype interview with Sive and Reynolds-Cuellar.
As you click around from one Blipp to the next, you can end up wandering from one topic to another for quite some time, each with its own in-depth write-up.
For example, if your most popular, least-bounced page is an in-depth write-up about early childhood psychology, consider other articles that supplement that topic, or even adding media such as images or video to the page to make it even more valuable.
This extensive, in-depth write-up from Sam Stein tracking Santorum's long, slow race to the bottom, from the beginning of his political career to now, offers a very instructive window into the all-too-common mindset that presumes the absolute rectitude of one's own views and the absolute immorality of anyone who disagrees.
Field Note Series: UNICEF Policy and Programming in Practice (2010) A Field Note is an in-depth write-up of cases from different countries where a similar programmatic strategy or approach has been implemented.
