A setting to enable search words in a region when the region is specified or a word at the point when the region is not specified. Results are displayed in EWW-mode which enables to do everything inside Emacs.
(setq eww-search-prefix "https://www.google.co.jp/search?btnI&q=")
;;
(defun my-eww-search--words (words)
"search web search engine for word on cursor."
(let ((search_words (read-from-minibuffer "EWW search for: " words)))