Perhaps you should try some spelling variations:
"dung choi tre snippets" » "dung cho tre snippets", "dung chi tre snippets", "dung thoi tre snippets", "dung tuoi tre snippets", "dung khoe tre 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 choi tre 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 choi tre snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung choi tre snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung choi tre snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.