Perhaps you should try some spelling variations:
"dang van dung snippets" » "hoang van dung snippets", "hang va dung snippets", "dang van dong snippets", "dang xay dung snippets", "dang tin dung snippets", "dang van dung slippers"
"hanh va java snippets" » "hang va java snippets", "hanh vi java snippets", "hanh java java snippets", "hanh va java slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("hanh va java snippets") or ("dang van dung snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh va java snippets") OR ("dang van dung snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh va java snippets ) or ( dang van dung snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh va java snippets") or ("dang van dung snippets"))) or ("locating bug code snippets"))*.