SEO optimization-keyword weight

My website title has three keywords, the last keyword is "rural farming technology", according to Baidu word segmentation rules, it can be divided into "rural farming, planting technology, breeding technology, rural farming technology" and so on. We take the word "rural farming, farming technology, rural farming technology" as an example,

According to common sense, "rural farming" ranks fifth among nearly 20 million results, so the "rural farming technology" ranks better than the former, the more long-tail keywords that are similar to the title, the less people are used, and the better the ranking is. But why is it not true here?

This is the keyword weight we are talking about today. As shown in the figure above, the competition for "rural farming" is more intense than the other two keywords, but the search volume is very low, therefore, the keyword weight of "farming technology" is higher than that of "rural farming". Therefore, when searching "rural farming technology", Baidu will give priority to matching "rural farming technology ", the second is farming technology, and the last is rural farming ". In my website title, "farming" and "technology" are separated by "planting", and the keyword weight is reduced. Naturally, the search for "rural farming technology" won't rank well, although "rural farming technology" appears three times in the Description and the page text, the key words on the page are much less important than the title.