Perhaps you should try some spelling variations:
"toc chuan long snippets" » "toc chat long snippets", "toc chua dong snippets", "toc quan long snippets", "tac chuan long snippets", "toc cham long snippets", "hoc chan long snippets"
"dung java java snippets" » "dung va java 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: (((("toc chuan long snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toc chuan long snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toc chuan long snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toc chuan long snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.