Use the following tips to optimize your searches:
Use "&" to find images that contain both words:
image & photo
Use "|" to find images that contain either word:
image | photo
Use "-" to find images that contain "image" but not "photo"
Use "(" and ")" to group parts of the search
(photo | photograph) image
Use quotes to match a phrase
"the best photo"
All of these may be combined
"the best photo" & (portrait | travel) photographer