say cell A1 had two words for search query e.g. android developer

that needs url encoding to handle the space between words:
VBA:

"https://www.googleapis.com/customsearch/v1?alt=json&cx=016252715861662448569:taxvfdziuic&num=10&start=1&key=AIzaSyCoBjCX0YPbKfNin3tvaQxdl8aEGBH56Ec&q=" & Application.encodeURL("android developer")

which gives:

"https://www.googleapis.com/customsearch/v1?alt=json&cx=016252715861662448569:taxvfdziuic&num=10&start=1&key=AIzaSyCoBjCX0YPbKfNin3tvaQxdl8aEGBH56Ec&q=android%20developer"

You then do the request against that

.Open "GET", "https://www.googleapis.com/customsearch/v1?alt=json&cx=016252715861662448569:taxvfdziuic&num=10&start=1&key=AIzaSyCoBjCX0YPbKfNin3tvaQxdl8aEGBH56Ec&q=android%20developer", False

You can do that in the sheet with =ENCODEURL("words to be joined go here")