This is the 9344th most frequent Russian word.
таиланда
"Тайланда" is the genitive or prepositional case of "Таиланд," meaning "of Thailand" or "in Thailand" in English, depending on context.
Here, 'Таиланда' is the genitive case of 'Таиланд', indicating the origin of the souvenirs.
Она привезла сувениры из Таиланда.
She brought souvenirs from Thailand.
In this sentence, 'Таиланде' denotes location, and 'Таиланда' is inferred as the nominative root.
Погода в Таиланде очень теплая.
The weather in Thailand is very warm.
Here, 'Таиланд' is used in the accusative case for the direction of travel, with 'Таиланда' as nominative root in context.