Students in academic contexts are expected to engage with large amounts of reading and they frequently meet unknown words and phrases in those reading materials. Previous research has shown that second and foreign language learners can acquire some of the unknown vocabulary that they encounter during reading. However, these previous findings were…

This study examined whether the reading passages in the new series of English-language textbooks for high-school students in Vietnam fostered reading comprehension and incidental vocabulary acquisition through reading by looking at four factors: the number of unfamiliar words in the texts, the importance of these words for text comprehension, the…