Unfortunately, Speed Fan doesn't always accommodate the specialised hardware you often find in a notebook — that's where Notebook Fan Control, or NBFC for short, can save the day.
The UX32VD and UX31A are notorious for their temperamental fans (well fan in the case of the latter), and trying to control them via the usually utilities just doesn't work. I personally own a 32VD and while the fan isn't too bad, I did find it frustrating that the usual batch of fan control programs didn't want anything to do with my machine.
A user by the name of "Grantig" on the Computer Base forums took the time to create a program that can handle more modern notebooks, including the aforementioned ASUS models.
That said, the range of systems it does support is generous, but not extensive — here's the full list:
Acer Aspire 1410 Acer Aspire 1810T Acer Aspire 1810TZ Acer Aspire 1825PTZ Acer Aspire 7735 Acer Aspire LT-10Q Acer Aspire One AO531h Acer Aspire One AO751h Acer Aspire One AOA110 Acer Aspire One AOA150 Acer Aspire S3 Acer TravelMate 7730G Asus F5SR Asus M52VA Asus N550JV Asus N56VZ Asus Vivobook S400CA Asus Zenbook UX31A Asus Zenbook UX32A Asus Zenbook UX32VD Asus Zenbook UX51VZA ESPRIMO Mobile V5505 Gateway LT31 HP Compaq 615 HP Compaq 625 HP Compaq 8710p HP EliteBook 2760p HP EliteBook 8560p HP EliteBook 8760w HP Pavilion dv6 HP ProBook 4530s HP ProBook 4535s HP ProBook 4540s HP ProBook 4710s HP ProBook 6460b HP ProBook 6465b HP ProBook 6560b Lenovo x121e 30515YG Lenovo Yoga 13 2191 Medion Akoya P6630 Packard Bell DOA150 Packard Bell DOTMA Packard Bell DOTMU Packard Bell DOTVR46 Packard Bell ENBFT PackardBell Easynote TJ65 Sony Vaio SVE1711 Sony Vaio SVT1312M1ES
That said, all the configuration files are stored in XML, so it is possible to come up with your own, if you're willing to figure out the inner workings of your notebook's embedded controller.
[Vorstellung] NoteBook FanControl (NBFC) [Computer Base]
Download Notebook Fan Control [SkyDrive]