One explanation could be that the target MWT does not occur in the comparable corpus, or the source concept occurs in the target corpora but under a non terminology-like form, or an error during the preprocessing of the corpora induces that the terminology extraction program misses the MWT.
in the previous example, if we find two English translations for the component familial (C s2 ) such as familial and family in the target language then we obtain two context vectors: V ′ s2 1 and V ′ s2 2 (see Figure 2).