The FBI said on June 17 that they are offering a $10,000 reward for information that helps to find Zhang, US media reported.
However, the whereabouts of Zhang remain a mystery until now.
Many Chinese netizens questioned why the FBI has failed to solve the case so far.
"The FBI was just able to find the car even with the help of the surveillance camera? It looks like the FBI is only FBI in the US TV series," said Sina Weibo user "tejingsir."
Zhang's case has also triggered heated discussion in China on students' safety, with many parents who are planning to send their children to study in the US saying they will "reconsider their decision."
The US Embassy in China told the Global Times previously that "a safe environment for all students is a top priority for school administrators in the US. Instances of violence on campuses in the US are very rare."
"I was considering to send my children to the US before Zhang's case. But now I have ruled the US out of my list because it is not safe, for example, the country has no gun control," a parent in Southwest China's Yunnan Province told the Global Times.
Zhang's family arrived in the US on June 17 where they met with the authorities and university officials.
"Once my daughter is found, I will never let her visit the US again," Yingying's father, Zhang Ronggao was quoted by the Beijing Youth Daily as saying.
UIUC Police said previously on its Facebook page that the surveillance camera recorded Zhang standing on the street when the Saturn Astra pulled up beside her.
This article, written by Zhao Yusha, was originally published in the Global Times.