How to correctly control the positions in the search engines?
If you think that your positions in search engines are falling down it may not be true.
If you are looking for keywords like that you insert the keyword in to www.google.com you have done it incorrectly.
Google shows you personalized results of searching only for you. If you are searching specifically terms on which are the pages optimalized - Google moves your website down. If you are checking your positions every day in month your results will be mixed.
The only one objective control of positios is by device:
https://adwords.google.com/d/AdPreview/
Measure your positions in Google with the tool Collabim. It will save you a lot of time and offer adetailed picture of how the position of keywords are changing in Google.