Perhaps you should try some spelling variations:
"dung tinh doi snippets" » "dang tinh doi snippets", "dung ninh doi snippets", "dung tin doi snippets", "dung trinh doc snippets", "dung trinh do snippets", "dung tinh hoc snippets"
"hang java java snippets" » "hang 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: (((("dung tinh doi 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 tinh doi snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tinh doi snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tinh doi snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.