Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dung son cong snippets" » "dung san cong snippets", "dong son cong snippets", "dung so cong snippets", "dung song cong snippets", "dung bon 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: (((("dung son cong snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung son cong snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung son cong snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung son cong snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.