This study aims to present a teaching proposal regarding a vocabulary expansion in Portuguese as a foreign language (PFL), through lexical field theories and studies that entail the contemporary teaching-learning process. This proposal enphasizes the teaching-learning process that is set in an adapted Virtual Learning Environment (VLE): Skype. The study displays an example of a class routine set in the VLE and also presents other online tools that may contribute to teachers who aspire to lecture online classes. The study is based on methodological assumptions that encompass research-action used to collect the data from experimental classes in the Skype environment. The results of this research show how productive the teaching of PFL is through the lexical field theories. The teaching-learning of vocabulary is done in a progressive way through a didactic sequence based on diverse subjects, yet interconnected. It is also seen that online tools can enhance the learning process of students.