Spell-checking repeated words such as Mau Mau

I've been trying for weeks to put Mau Mau into my computer's dictionary so Word's spellcheck doesn't keep asking if I have doubled up on the word "Mau".
Tim Symonds

If you're running Word 2007 you can click the globe, select Word Options and then Proofing, and untick the box where it says "Flag repeated words". Of course, this will no longer catch errors where you repeat words by mistake. Another workaround is to join the two words with a non-breaking space (that is, Ctrl+Shift+Space): Word will treat the combination as a single word and not flag it up. The drawback is that the two words will no longer separate over a line break. A third way is to type the two words as one word (MauMau) and add that to the dictionary. Before saving the file for the final time, do a search-and-replace to convert MauMau to Mau Mau.