  We studied the $D\bar{D}^\ast/\bar{D}D^\ast$, $D^\ast\bar{D}^\ast$,
$\bar{D}_s D^\ast/\bar{D}_s^\ast D$, $B\bar{B}^\ast/\bar{B}B^\ast$ and
$B^\ast\bar{B}^\ast$ di-hadron interactions in chiral effective field theory
($\chi$EFT) up to the next-to-leading (NLO) order. The above-threshold
tetraquark states $Z_c(3900)$, $Z_c(4020)$, $Z_{cs}(3985)$, $Z_b(10610)$,
$Z_b(10650)$ can be explained as the corresponding di-hadron resonances,
respectively. We also studied the $\Sigma_c^{(\ast)}\bar{D}^{(\ast)}$
interactions to investigate the three hidden-charm pentaquarks $P_c(4312)$,
$P_c(4440)$ and $P_c(4457)$. We further used the parameters fixed from the
$P_c$ states to predict the possible molecular states in
$\Xi_c\bar{D}^{(\ast)}$, $\Xi_c^\prime\bar{D}^{(\ast)}$ and
$\Xi_c^\ast\bar{D}^{(\ast)}$ systems. Our predictions of the
$\Xi_c\bar{D}^{(\ast)}$ bound states are very consistent with two new
near-threshold structures recently observed by the LHCb Collaboration.
