After preliminary study we have collected 35 species bearing essential oil belong botanical families. The oil yield of 21 species, chemical composition of 7 species among them 6 species first time was studied in detail in Vietnam such as : Liquidambar formosana, Neolitsea sp., Clausena aff. excavata, Euodia lepta, Glucosmis pentaphylla, Zanthoxylum avicennia were determined
Modernization of traditional drugs of ethnic minorities in Vietnam