Perhaps you should try some spelling variations:
"dung kinh mon snippets" » "duong kinh mon snippets", "dong kinh mon snippets", "dung ninh mon snippets", "dung dinh moi snippets", "dung kinh hoc snippets", "dung kinh co 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 kinh mon 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 kinh mon snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung kinh mon snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung kinh mon snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.