Perhaps you should try some spelling variations:
"dung cung chem snippets" » "dung chung chem snippets", "dung cong chem snippets", "dung ung chem snippets", "dung cong che snippets", "dung cung chua snippets", "dung cung tham 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: (((("dung cung chem snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cung chem snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cung chem snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cung chem snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.