  These talks review and summarize our results in [1,2] on $XYZ$-like spectra
obtained from QCD Laplace Sum Rules in the chiral limit at next-to-next-leading
order (N2LO) of perturbation theory (PT) and including leading order (LO)
contributions of dimensions $d\leq 6-8$ non-perturbative condensates. We
conclude that the observed $XZ$ states are good candidates for $1^{+}$ and
$0^+$ molecules or / and four-quark states while the predictions for $1^-$ and
$0^-$ states are about 1.5 GeV above the $Y_{c,b}$ experimental candidates and
hadronic thresholds. We (numerically) find that these exotic molecules couple
weakly to the corresponding interpolating currents than ordinary $D,B$
heavy-light mesons while we observe that these couplings decrease faster
[$1/m_b^{3/2}$ (resp. $1/m_b$) for the $1^+,0^+$ (resp. $1^-,0^-)$ states] than
$1/m_b^{1/2}$. Our results do not also confirm the existence of the $X(5568)$
state in agreement with LHCb findings.
