"continuing help" is correct and usable in written English.
You could use it in a sentence like "We are grateful for your continuing help in this project."
The economy is still in deep trouble and needs continuing help.
Larry: On Long Island we need continuing help with pest management techniques that are environmentally responsible.
We can't match his super-localism on the Northerner - yet - but with his continuing help, we will.
With a little help from Neediest Cases, and continuing help from Ms. De Veaux, the Davises are making it.
They can treat a patient in a diabetic coma, but they cannot provide continuing help in managing diabetes.
True to his promise of continuing help, Mr. Reed made a two-day visit to Kentucky last year.
With continued help, we surely can beat that target.
He was given a 120-day mandate and guaranteed continued help from the army.
After touring the damage, Mr. Obama pledged continued help "even after the TV cameras leave" and waved aside questions about politics.
Washington has given Islamabad more than $10 billion since 9/11, and the new government will need continued help.
When the parents are better off than the children, coresidence implies parents' continued help or investment in their children (Chen 1998).
