For subject related databases, use the Databases A-Z function in LUBsearch and browse by subject. Or you could browse the Subject resources-section in this LibGuide. https://lub.libapps.com/libguides/admin_c.php?g=296923&p=4795268
Remember that an easy way to find review articles is to add "review" to your search in LUBsearch or (even easier!) to use the review articles-filters when using Scopus or Web of Science.
But also feel free to try out the Annual Reviews database containing review articles only.
If you're looking for a narrow subject, begin your search for handbooks by searching for "handbook *subject in question"" in LUBcat. Maybe you're lucky and find something very useful and specific right away.