Perhaps you should try some spelling variations:
"dang minh can snippets" » "dang dinh can snippets", "dang sinh can snippets", "dang tinh can snippets", "dang minh chanh snippets", "dang minh danh snippets", "dang minh tuan 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: (((("dang minh can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang minh can snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang minh can snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang minh can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.