Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"doc cac cach snippets" » "doc cai cach snippets", "doc cuoc cach snippets", "doc va cach snippets", "duoc cac cach snippets", "hoc cac cach snippets", "do cac cach snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("doc cac cach snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doc cac cach snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc cac cach snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc cac cach snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.