Abstract Pronouncing the problematic sounds in minimal pairs is a challenging task for Vietnamse students. This article investigates the errors in producing the minimal pairs /p/-/b/, /t/- /d/, /tʃ/-/dʒ/ committed by the junior high school students (JHS) in grade 7 at Victory of school. Data was mainly collected from questionnaires and diagnostic test from 60 students at the school to look for qualitative and quantitative information for this descriptive research. Besides, the voices of 12 students of the school were recorded with the software Audacity - win 2.3.3 used to record and edit sounds. The result shows that most of the students make errors when performing these sounds of phonemes, for example when they often pronounce /b/ like /p/ and /tʃ/ like /dʒ/ at initial positions of the words, they often forget to release the sound /p/, /b/, /t/, /d/, /tʃ/, /dʒ/ at the final positions of the words. One of main causes of these errors is that students are unable to distinguish English sounds well. The article proposes the measures to help students overcome the errors when performing these sounds to gradually improve their pronunciation ability.