"strongly vary" is a correct and usable phrase in written English.
You would use it in situations where you need to emphasize a significant change or difference in something. For example, "Opinions on this issue strongly vary among experts."
Although ride lengths strongly vary between taxi and scooter business, we think about potential combinations of both areas".
Both of these performance indicators strongly vary with the initial water content of the substrates.
Species response to forest fragmentation may strongly vary according to ecological requirements, shape, spatial configuration and connectivity of fragments, and the structure of the surrounding matrix.
Modelled results show that isoprene emission rates strongly vary with canopy depth, with maximum values coinciding with canopy layers with largest amount of active biomass.
The strong spatial heterogeneity observed in contact rates implies that the effectiveness of particular control interventions can strongly vary depending upon host density, landscape composition, and functional connectivity.
From literature and from plotting our data against the Keulegan Carpenter number we expect that these coefficients strongly vary due to flow separation effects.
We show that the performance of the various sampling methods strongly varies depending on context.
However, as already shown Fig. 7, the range of temporary employment strongly varies among EU countries.
The results showed that the residual error variances strongly varied across locations in all of the considered trials.
In addition to the conserved core, most APs contain a crown domain that strongly varies within species.
The intensity of the various peaks observed on the four spectra strongly varies with the nanotube concentration.
