“AN ANALYSIS OF LEXICAL COLLOCATION ERRORS IN ACADEMIC IELTS WRITING TASK 2 BY VIETNAMESE STUDENTS IN AN ENGLISH CENTER”. The International Journal of Language Studies (ISSN : 3078 - 2244), vol. 2, no. 2, May 2025, pp. 31-54, https://doi.org/10.60087/ijls.v2.n2.004.