This is the 10480th most frequent Turkish word.
bulana
"Bulana" means "to the one who finds."
In this sentence, 'bulana' is derived from the verb 'bulmak' (to find) and implies 'to the one who finds'. It is post-fixed to indicate an indirect object, showing the person it refers to.
Bu kitabı ilk bulana ödül vereceğiz.
We will give a reward to the first person who finds this book.
Here, 'olana' as part of 'destek olana' (to the one who supports) specifies the person indirectly receiving the action.
Bu akşam yemeği hazırlayan kişiye çok teşekkür edenlere, destek olana ne kadar teşekküredeceğimizi şaşırıyoruz.
Tonight, we are surprised about how much we thank those who thank the person who prepared the dinner and supported him.
In this usage, 'bulana', from 'bulmak' (to find), denotes 'those who find' in a general unconditioned sense.