  Abundances of lithium, carbon, and oxygen have been derived using spectral
synthesis for a sample of 249 bright F, G, and K Northern Hemisphere dwarf
stars from the high-resolution spectra acquired with the VUES spectrograph at
the Moletai Astronomical Observatory of Vilnius University. The sample stars
have metallicities, effective temperatures, and ages between -0.7 and 0.4 dex;
5000 and 6900 K; 1 and 12 Gyr, accordingly. We confirm a so far unexplained
lithium abundance decrease at supersolar metallicities - $A$(Li) in our sample
stars, which drop by 0.7 dex in the [Fe/H] range from +0.10 to +0.55 dex.
Furthermore, we identified stars with similar ages, atmospheric parameters, and
rotational velocities, but with significantly different lithium abundances,
which suggests that additional specific evolutionary factors should be taken
into account while interpreting the stellar lithium content. Nine stars with
predominantly supersolar metallicities, i.e. about 12 % among 78 stars with C
and O abundances determined, have the C/O number ratios larger than 0.65, thus
may form carbon-rich rocky planets. Ten planet-hosting stars, available in our
sample, do not show a discernible difference from the stars with no planets
detected regarding their lithium content.
