Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dung hoc tre snippets" » "dong hoc tre snippets", "dung thuoc tre snippets", "trung hoc tre snippets", "dung hoc tren snippets", "dung hoc te snippets", "dung soc tre 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 hoc tre 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 hoc tre snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung hoc tre snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung hoc tre snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.