The phrase 'emphasize the theme' is correct and usable in written English.
You can use it whenever you are wanting to add emphasis to a particular theme. For example, "The tone of the article was neutral, but I wanted to emphasize the theme that climate change is a real threat."
Shouldn't it be patchy, to emphasize the theme of decay?
Two guest heroes -- Hawk and Dove -- turn up to emphasize the theme of a Wonder Woman episode.
Campaign aides said the party was trying to send a message about the president, trying subconsciously to build on and reinforce ideas and themes of his campaign, and especially to emphasize the theme of strength.
Those elements, Mr. Mcmurray's reedy croon in particular, lend a relatable aspect to an otherwise pleasurably inscrutable evening of ambient washes and elemental bashes, and emphasize the theme of communal interaction intrinsic to this ambitious, beguiling show.
Mr. Kerry planned a new television spot on Friday in New Hampshire and on Sunday in Iowa to emphasize the theme he has used to try to revitalize his candidacy, the issues he would fight for in his first 100 days as president.
To emphasize the theme, Shargawi points out a crowd of demonstrators who surround a group of police yet refrain from assaulting them.
In his speech and subsequent travel, Mr. Obama will emphasize the themes of job creation and fair shakes for the middle class that will be the core of his re-election pitch.
A practicing director, actor, and playwright, David will focus our attention on the theatrical possibilities and challenges of each production, while Glenn will emphasize the themes and contexts of the plays.
Instead, they were placed to emphasize the themes of her books, which include racism, identity, family, and travel.
The event was carefully crafted to emphasize the themes of the campaign and avoid some of the controversies swirling around Wilson's interest in the White House.
