Search for items. Possible errors: "OrderByValidationError" - use of non-existing sort order (OrderBy). "SearchStringValidationError" - when searching for invalid search words. "InternalError" - internal error. Search for items with advanced parameters. Possible errors: "OrderByValidationError" - use of non-existing order by (OrderBy). "ItemTypeValidationError" - use of non-existing item type (ItemType). "SellerTypeValidationError" - use of non-existing seller type (SellerType). "ModeValidationError" - use of non-existing mode (Mode). "ItemStatusValidationError" - use of non-existing item status (ItemStatus). "ItemConditionValidationError" - use of non-existing item condition (ItemCondition). "SearchStringValidationError" - when searching for invalid search words. "InternalError" - internal error. Search for category count. Possible errors: "SellerTypeValidationError" - use of non-existing seller type (SellerType). "ModeValidationError" - use of non-existing mode (Mode). "ItemTypeValidationError" - use of non-existing item type (ItemType). "ItemStatusValidationError" - use of non-existing item status (ItemStatus). "ItemConditionValidationError" - use of non-existing item condition (ItemCondition). "SearchStringValidationError" - when searching for invalid search words. "InternalError" - internal error. Search for items on given zip code. Search with a fixed set of possible lists.