Tosfos (Megilla 7a) note that we do not generally learn multiple Halachos from one phrase. This verse is different because “v’kiblu” (“and accepted”) is written differently than it would be pronounced.
Yosef Lekach writes that the word is written in singular, but pronounced in plural to show that Jews accepted the Torah for future generations.
The holy Zohar (Kee Seesa), however, explains that this is due to the fact that when Moshe received the Torah at Har Sinai, he accepted all of TaNaCh – even Megillas Esther.
The Ginzei HaMelech writes that, since vuv has the gematria of six, the missing vuv alludes to the Mishna, which has six orders.