Perhaps you should try some spelling variations:
"cong tap cach snippets" » "cong tap code snippets", "cuong tap cach snippets", "cong tac cach snippets", "cong tan cach snippets", "cong tap cac snippets", "cong phap cach snippets", "cong va cach snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("cong tap cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong tap cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong tap cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong tap cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.