Use the following tips to optimize your searches:

Use "&" to find images that contain both words:

hot & dog

Use "|" to find images that contain either word:

hot | dog

Use "-" to find images that contain "hot" but not "dog"

hot -dog

Use "(" and ")" to group parts of the search

(hot | lazy) dog

Use quotes to match a phrase

"the lazy dog"

All of these may be combined

"days of summer" & (hot | lazy) dog