The phrase "a core theme that" is correct and usable in written English.
You can use it when discussing the main idea or underlying message of a text, artwork, or concept.
Example: "In her novel, the author explores a core theme that reflects the struggles of identity and belonging."
Alternatives: "a central theme that" or "a fundamental theme that".
Another core theme that plays a big part off the tracks is her relationship with Sednaoui (and previous relationships).
The core theme that runs through these, and the mission that gets my colleagues and I out of bed every morning, is motivating people through data.
The core theme that emerged during the analysis was 'facing the limit of resilience'.
The film's concept was that the Mothers had gotten stuck on tour in a Middle American town and were acting out in ways illustrative of the core theme that "touring can make you crazy".
On NBC, Bratton repeated the core theme that he struck in his remarks at the Ramos funeral – that mutual understanding must be found between police and protesters.
Manmohan Singh said, "We have an obligation to the people of India to provide a stable and secular government," underscoring two core themes that helped the Congress retain power in one of the most fiercely fought electoral battles since independence 62 years ago.
The talk's new title reflects one of three core themes that ran through the talk — the importance of people.
The two core themes that emerged were the motivating/de-motivating effect of body size representation on health behavior intentions, and the social implications of being overweight.
These issues are raised in relation to five core themes that are highly relevant online: identity, privacy, authorship and ownership, credibility, and participation.
Open coding drawing upon the tenets of complexity theory was used to develop four core themes that provide structure for the framework that evolved; they relate to dynamic context, situational awareness and connectedness, flexible planning, and collaboration, which are needed to foster adaptive responses to disasters.
