I can search for files which have a specific word by using grep

grep -l "word" /path

However what if I want to search for files which have "word 1" and "word 2" in a same line? I can use:

mkdir new;for i in * do;grep "word 1" $i > new/$i_new;done

then use

grep -l "word 2" /new

But I would like to have a one line command. Using

egrep -w -R 'word 1|word 2' /path

only search for lines have "word 1" OR "word 2".

What if I have "word 3", "word 4"?