i have some site:
with keys: cua luoi chong muoi, luoi chong muoi, mai hien di dong, san go cong nghiep, san go
sometime my site has good position, sometime it disappear off first google search result page.
arcoding to my some friend, i know that is the time when google dance.
the question is : how can we guess that time to prepare my workk better.
and i know google 'll update page rank per several month, can we guess the time when google update?
thank you very much!