The search function on this site is pretty basic, to say the least. So there are no “hard wired” ways of finding someone willing to relocate, via the member search.
However, you could simply try a few suitable keywords, which might identify users who have stated their intent in the About Me section of their profile.
Example:
On the Search page, select “Show me … : Female” then try the following words in the “Find Any Word” field…
relocate, re-locate, relocation, re-location, re-locating, travel, moving, etc etc etc
Try a separate search for each keyword.
(Tip: searching once for “reloc” and once for “re-loc” is enough to cover all the multiple-ending variations of those words)