Hello and welcome to poe.xyz.is.
You'll love it.
This field allows you to search items based on name. This is mostly useful for unique items and gems. Note that this field only accepts full words.
scouringis a valid query but
scourwill yield zero results.
maxfields here are not to be confused with
Physical Damageminimum and maximum damage. Those are calculated as their average value.
For example, consider an item with
Physical Damage: 123–183. In that case the
(123 + 183) / 2 = 153. For that item to appear on search results page the
minfield should be set to something less (or equal) than 153 and
maxto something greater (or equal) than it.
DPS (damage per second) is calculated as a multiplication of average damage (physical and elemental combined) and APS (attacks per second).
eDPS is elemental damage per second. It's calculated the same way as DPS but only elemental damage is considered.
pDPS is physical damage per second.
Math is fun
DPS = eDPS + pDPS + chaos DPS
Number of red, green and blue sockets you want to see on an item goes here.
Works the same way as "Colors", but all sockets will be linked. For example, to find items suitable for vendor's chromatic recipe you should enter 1, 1, 1 here.
Do not confuse implicit modifiers with explicit, they are totally different.
Check the wiki if you're not sure what "Quality" means: 
This should not be confused with "Requirements" — "Level". This property is mostly used for gems and maps.
This is only applicable to maps.
Only items sold by sellers that are:
1) on ladder
will be shown.
Only items with buyout specified will be shown.
Note: sellers have to use special buyout tags for this option to work correctly (many already do!).
This option will filter out sellers that weren't seen on forums since the date specified here. By default it's set to be a week ago.
The time a seller is considered "last seen" is calculated as a maximum from last post, last visit date and last post edit.