How to extend `Ctrl+R` search in zsh? It cannot find entry despite it is in history file.

**Edit:** My `.zshrc`:

```
setopt AUTO_CD
setopt CORRECT_ALL
setopt EXTENDED_GLOB
# History
SAVEHIST=10000
HISTFILE=~/.zsh/history
setopt APPEND_HISTORY
setopt EXTENDED_HISTORY
setopt INC_APPEND_HISTORY
setopt HIST_FIND_NO_DUPS
setopt HIST_IGNORE_SPACE
setopt NO_HIST_BEEP
setopt SHARE_HISTORY
# Keys
autoload zkbd
[[ ! -d ~/.zkbd ]] && mkdir ~/.zkbd
[[ ! -f ~/.zkbd/$TERM-${DISPLAY:-$VENDOR-$OSTYPE} ]] && zkbd
source  ~/.zkbd/$TERM-${DISPLAY:-$VENDOR-$OSTYPE}
[[ -n ${key[Home]}    ]]  && bindkey  "${key[Home]}" beginning-of-line
[[ -n ${key[End]}     ]]  && bindkey  "${key[End]}"     end-of-line
[[ -n ${key[Insert]}  ]]  && bindkey  "${key[Insert]}"  overwrite-mode
[[ -n ${key[End]}     ]]  && bindkey  "${key[End]}"     end-of-line
[[ -n ${key[Insert]}  ]]  && bindkey  "${key[Insert]}"  overwrite-mode
[[ -n ${key[Delete]}  ]]  && bindkey  "${key[Delete]}"  delete-char
[[ -n ${key[Up]}      ]]  && bindkey  "${key[Up]}" up-line-or-history
[[ -n ${key[Down]}    ]]  && bindkey  "${key[Down]}" down-line-or-history
[[ -n ${key[Left]}    ]]  && bindkey  "${key[Left]}"    backward-char
[[ -n ${key[Right]}   ]]  && bindkey  "${key[Right]}"   forward-char
# Auto completion
autoload -U compinit promptinit
compinit
promptinit
prompt clint
zstyle ':completion::complete:*' use-cache 1
# MIME
autoload -U zsh-mime-setup
zsh-mime-setup
# Calc
autoload -U zcalc
# Editor
export EDITOR=vim
# Useful
alias background="schedtool -B -e"
alias lowprio="nice -n 20 ionice -c 3"
alias blowprio="ionice -c 3 schedtool -B -e nice -n 20"

```

`cave resolve -c` should find `blowprio cave resolve -c world -C a -R w --resume-file resume-world` which is in `.zsh/history` (at least `grep` says so) but it finds no match.