There are a lot of researchs in the world on the relationship between everyday language and mathematical language, difficulties in language that students often encounter in math, mathematical language problems in mathematics program in some countries in the world... There were some researchers in Vietnam interested in mathematical language problems and the mathematical language useing in secondary schools. This paper is an overview of research of mathematical language problems in Vietnam and the world to expect a suggesting of researching directions for more than results of research on mathematical language, application of mathematical language in teaching practice,...