User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-4813670-20131015130755/@comment-11685710-20131017195147

BellGoRing is right DemonKyd!

You couldn't search for rooms with for example Abyssal Lagia and the other Rare subs until you reached HR8. I guess you're still too low in terms of hunter rank to join those quests.