Enter only what you positively know and leave the rest blank.
A list of parcels that match what you enter will be displayed.
You may then select the desired parcel from that list.

For Example:
If you are unsure of the parcel #, but know it starts with 01, enter just 01.
If you are unsure of the owner name, but know the last name is Smith, enter just Smith.
If you are unsure of the full address, but know it is on Main Street, enter just Main.
If you are uncertain of the spelling of the street name, but know it starts with a W, enter just W.
It does not make any difference if you enter upper or lower case.