Its just my practise, maybe it will help you.
All you need is fuzzy search.
1. go fuzzy and set range to 81-83
(if you get no results set it on 81-8F)
2. Try search (first search)
3. Try search (second search) after you lose some energy, you should use the symbol "less"or if you get more Energy "more" and search again.
4. Repead 3. Until you get the right code or just few codes.
Do not search the same value twice because you will get 0 results.
This small tutorial works on most games but not all of them...