The category "<hmmwv>" can be expressed as follows:
hmmwv
hmmwv tow
hmmwv tows
hmmwv with a tow
hmmwv with tows
hmmwv-40
hmmwv-40s
hmmwv-50
hmmwv-50s
hmmwvs
hmmwvs with a tow
hmmwvs with tows