"more concern on" is not a grammatically correct phrase in written English.
A better way to express this idea would be "more concern about". For example: - The teachers have expressed more concern about the students' lack of progress. - The company is showing more concern about their environmental impact. - There needs to be more concern about the safety of our children in this neighborhood.
I think there's more concern on your behalf than mine.
Moreover, travelers having more concern on social, economic and environmental issues would have more potential of using carpooling.
Competition in the solar cell market is nowadays hard-hitting, so it is getting more concern on the cost in the manufacturing of the thin-film solar cells.
Recently, researchers have paid more concern on anodic material of electrodes and its electrochemical performance and degradation mechanism (Marselli et al. 2003; Chen 2004; Chang et al. 2009).
Some studies however express more concern on the basis of higher rates of transmission within the host country with foreign-born index cases.
Moreover, researchers had paid more concern on the effects of alloy composition (Williams et al. 2010), environment (Jafarian et al. 2008), potential (Lee et al. 2011), and temperature (Lee et al. 2010).
In studying the issue of the empty-nest elderly, Chinese scholars are more concerned on the urban elderly than the rural ones [ 25].
Iman said his parents grew more concerned on Tuesday when a visit to the prison was cancelled without explanation.
In the Middle East, the equation switches when China becomes more dependent on a steady oil supply and more concerned on an economic basis about the region than the United States.
Some of her biggest donors grew even more concerned on Wednesday when her advisers said that she had lent the campaign $5 million of her own money and that some senior aides were working this month without salaries.
"We got about a half a mile through that and he just got to feeling so good, and I was more concerned on what tonight would be like, so I elected to turn him around and gallop him half a mile instead of finishing off the half-mile with the jog -- just to try to take a little bit of the edge off," Servis said.
