They're not on the 1881 but if you know where in Canada they went, you could search the 1901 Canada Census at the National Archives at http://www.archives.ca/08/08_e.html, click on Genealogy, Click on Census Records, Click on Search the 1901 Census. It's not an easy site to search as you must know the geographical area and then there are a huge amount of records you must look through, but maybe worth the effort?