"their maintenance" is correct and usable in written English.
For example, "The couple hired a handyman to do regular repairs and maintenance on their home, including their maintenance of the roof."
The government pays for their maintenance.
Any small translucent container will do for their maintenance.
(clue: their maintenance loans haven't just come in).
Peace corps volunteers in the US are not paid above their maintenance in-country.
Instead, they will need to take out loans to cover the entire cost of their maintenance.
This means that it is not worth the owners – often absentee landlords – investing in their maintenance.
Many of our public parks are a disgrace in terms of their maintenance.
They are not too dark or too small, and their maintenance is not too high.
Until 1998, the state reimbursed the counties 25percentt of their maintenance costs.
"Students need to apply for their maintenance and tuition fee loans each year.
They don't get the same economic benefit to help with their maintenance.
