Finding duplicates is not an easy task: it requires both topic expertise and familiarity with the site. There's a rule-of-thumb over at meta.SE:
Questions may be duplicates if they have the same (potential) answers. This includes not only word-for-word duplicates, but also the same idea expressed in different words.
How should duplicate questions be ...
The two questions mentioned are slightly different. One was asking why the adjectival marker 的 is needed in reduplicated adjectives, another one is asking why adverbs of degree like 很 (very) are not used on reduplicated adjectives. The two questions were answered differently.
But it is beside the point. There are actually many duplicated questions. When I ...
i guess you’re requesting “google custom search”
or, try the syntax “search in specified site only”:
[type in the search field]
have fun :)