Perhaps you should try some spelling variations:
"doi duy trinh snippets" » "doi quy trinh snippets", "doi duy thinh snippets", "doi qua trinh snippets", "do duy trinh snippets", "doi day trinh snippets", "doi duy trinh slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"doi duy trinh snippets\") OR (\"dung java java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( doi duy trinh snippets ) OR ( dung java java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("doi duy trinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets"))*.