"increase their confidence" is a correct and usable phrase in written English.
It can be used to describe a situation in which one wants to help someone become more confident. For example, "The counselors held workshops to increase their confidence in their academic abilities."
We aim to increase their confidence and enthusiasm for books whilst improving their reading ability.
Everyday I'm sent press releases trumpeting about another women's mentoring programme or a course to help women increase their confidence.
Encouraging trustees to take simple steps, such as using social media, should help to increase their confidence in this area.
His research shows that with more engagement, introverts can refine their social skills and increase their confidence.
As one community mental health support worker puts it: "The campus visits have really helped to motivate our young people and increase their confidence to get educated".
One is the role of applied practice; using drama in a therapeutic way to help young people increase their confidence and explain their experiences of care.
We want to increase their confidence in the police and partners to encourage them to come forward so that we can intervene and help.
Thus it is hoped that the e-learning provided can help them to smaller the gap and increase their confidence in engineering study.
Empathy is good for police: Research suggests that empathy can help police officers increase their confidence in handling crises, diffuse crises with less physical force, and feel less distant from the people they're dealing with.
Giving the students ownership of the story will help to increase their confidence, their concept of self and their awareness of responsibility to become social and academic problem solvers.
I am aware from personal experience that giving people the opportunity to explore and understand the way in which judges approach sentencing can significantly increase their confidence in the criminal justice system".
