Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dac lac cong snippets" » "dac cac cong snippets", "dac lap cong snippets", "dac luc cong snippets", "dac sac cong snippets", "dac lak cong snippets", "dak lac cong 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: (((("dac lac cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dac lac cong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dac lac cong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dac lac cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.