"particularly focusing" is correct and usable in written English.
One example of using this phrase in a sentence could be: "I am particularly focusing on improving my writing skills this semester." This suggests that the speaker has a specific and deliberate focus on developing their writing abilities, rather than just a general focus on academic success.
The intelligence chiefs also raised warnings about nuclear proliferation, particularly focusing on Iran and North Korea.
A few studies have compared nursing education systems of Japan and Europe, particularly focusing on competency.
Complex technologies should therefore be managed with great foresightness, particularly focusing on preventive management.
Despite the biodiversity of the region, work is being done on marine conservation – particularly focusing on the vulnerable turtle population.
The paper then outlines some adaptation strategies, particularly focusing on the needs for risk-based selection of optimal adaptation measures.
This article reviews all three areas of research, particularly focusing on their application to rotator cuff tendon tears.
A week in Gaza Back in 2008 the Guardian spent one week reporting the impact of conflict on the ordinary people of Gaza, particularly focusing on children.
The Treasury has hired a search firm to find directors, particularly focusing on those with backgrounds in the auto industry and in corporate restructurings.
They are particularly focusing on the don't knows: those voters the Yes campaign believes are the most likely to switch to them.
Campaigners are particularly focusing on the fact that Oxted intends to first become a "foundation school", distancing itself from the local authority, then an academy.
He pores over financial statements, particularly focusing on a company's free cash flow, as well as its ability to generate cash in the future.
