Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cong li cac snippets" » "cong ti cac snippets", "hong li cac snippets", "cong hai cac snippets", "cong li ca snippets", "cong ly cac snippets", "cong loi 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: (((("cong li cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong li cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong li cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong li cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.