Yes, it's the inflection: "манера" (subjective case) -> "манере" (some other cases), "такое" (singular) -> "такие" (plural). Almost all of nouns and pronouns in Russian change their ending in different situations: if it's singular or plural, and according to declension. So you should search words letter-by-letter, not the whole ones.
I doubt if there is some dictionary which contains all of inflections of words available for searching, but I'll look to dictionaries I have. Maybe there's more convenient dictionary for you.
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