URN:NBN:SI:doc-GJJOEMB82020Blokhina, Tatiana K.Nghia, Pham T.documents/doc/G/URN_NBN_SI_doc-GJJOEMB8_001.pdfdocuments/doc/G/URN_NBN_SI_doc-GJJOEMB8_001.txt11111 str.article1855-931X24094723URN:NBN:SI:doc-GJJOEMB8engGEA CollegeAdvances in business related scientific research journalInCmarket of weak form of efficiencytime chain of random walkVietnamese stock marketImproving the efficiency of the Vietnam stock market