401 invalid signature when GET parameters contain unicode characters or SPACE

If the parameters contain unicode characters (like Vietnamese chars) or space then it will result `401 invalid signature`. For example: `http://duylv.anhphuongisc.vn/wp-json/wc/v2/products/categories?search=sản phẩm`

or even: `http://duylv.anhphuongisc.vn/wp-json/wc/v2/products/categories?search=san pham`

I tried the same URL in Postman with OAuth 1.0 and it works.