They are different portions of the mtDNA. Full Sequence includes all three portions so it looks for matches on all three portions:
https://www.familytreedna.com/learn/...coding-region/
Coding region is a closer match than the others, and HVR2 is a closer match than HVR1. If you have no matches on any of them, you don't have any mtDNA matches yet.
https://www.familytreedna.com/learn/dna-basics/mtdna/
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What does no HVR1, HVR2, And Coding Region Matches mean
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