Combine two words in a corpus with R

So here is my code

ny <- read.csv2("nyt.csv", sep = "\t", header = T)
ny_texte <- as.vector(ny)

iterator <- itoken(ny_texte,
                   preprocessor=tolower, 
                   tokenizer=word_tokenizer, 
                   progressbar=FALSE)

vocabulary <- create_vocabulary(iterator)

My .csv is articles from the new york times. I would like to combine words like "new york", "south africa", "ellis island" in vocabulary and not just have token like this : "new" , "york", etc

How can I do this ?

Thank You