Д178
ЗА ДЕРЕВЬЯМИ (ИЗ-ЗА ДЕРЕВЬЕВ) ЛЕСА НЕ ВИДЕТЬ
disapprovVPsubj:
humanusu. pres) not to have a complete understanding of the whole because one pays too much attention to minor details
X за деревьями леса не видит = X doesn't (can't) see the forest (the wood(s)) for the trees
X misses the forest for the trees.