The phrase "ambivalence stems" is correct and usable in written English.
It can be used to indicate the origin or source of ambivalence in a particular context or situation.
Example: "Her ambivalence stems from the conflicting advice she received from her friends."
Alternatives: "ambivalence arises" or "ambivalence originates".
Russia's ambivalence stems in large part from its renewed effort to assert a zone of influence, flexing its power across the former Soviet Union and deepening tensions with the United States on a range of issues.
Much of that ambivalence stems from the space race, which played out against a geopolitical landscape of intense nationalism that used space as a power play — both through the hard power of aiding weapons research and the soft power of seeking to impress newly independent former colonies.
Certainly, my ambivalence stems from the fact that good art makes us reflect on our own condition, as this film does magnificently when viewed by people of intelligence and thoughtfulness.
These ambivalences stem from counteracting pressures on the units of natural selection (Wilson 1995, 155).
This ambivalence may stem from the perception that humans have contributed to the problem.
Czech ambivalence toward the European Union stems in part from instinctive distrust for Europe and loyalty to the United States, conditioned during decades of invasion and occupation.
My initial ambivalence toward his furniture stemmed partly from the presumption by some sections of the art world that, as the work of an artist, it was somehow superior to a designer's.
(We're ambivalent about ambivalence).
The Yankees' go-slow approach stems from their ambivalence over whether they want to keep Phil Hughes and a younger pitching prospect, Jeffrey Marquez, or have Santana pitch at the head of their rotation.
Nearly every director interviewed for this article said the resurgence of plays about World War I — a conflict that many historians now believe to have been unnecessary, Mr. Hochschild noted — may stem from public ambivalence toward the current United States military engagements in Afghanistan and Iraq.
Men and women recounted a reluctance to seek help which stemmed from their ambivalence towards recovery 50 and both had experienced a prolonged diagnostic process.
