"reasonable suggestions" is correct and usable in written English.
You can use it when you are recommending ideas that are reasonable and practical. For example: "Through our discussion, we were able to come up with several reasonable suggestions on how to improve our customer service process."
These seem like reasonable suggestions.
All are reasonable suggestions, and most can be supported to some extent by textual evidence.
The support of system analysis and optimization techniques could lead to more scientific and reasonable suggestions.
So he could make reasonable suggestions to his student, this teacher tried on Mr. Keplinger's head contraption and tried painting with it.
The calculated results indicate that probabilistic approach can be used to determine the replacement thickness and can provide more reasonable suggestions for engineering application than the classical approach.
On the contrary, in all of our meetings he seemed to present very reasonable suggestions and no one really suspected that he would be a future candidate for political office.
This is a reasonable suggestion but unfortunately, there are important reasons for viewing it with caution.
On Riverside Drive she'll think of her first therapist, how for years she shook her head no to every reasonable suggestion he made, until one day he suggested she should teach, how it was like she'd been pouring nickels into the same slot machine for years and it finally paid out.
But whether your brother will think that's a reasonable suggestion, only he can say.
In this light, concern over Corbyn's popularity is not based on the reasonable suggestion that our politics is excessively focused on personality.
It was a reasonable suggestion, but I always found it funny that the same idea was never mooted for her son.
