Perhaps you should try some spelling variations:
"ngu java java snippets" » "ngu va java snippets", "ngu java java slippers"
"van than va snippets" » "van thanh va snippets", "van thang va snippets", "van tuan va snippets", "van nhan va snippets", "van toan va snippets", "van than va 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: (((("ngu java java snippets") or ("van than va snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu java java snippets") OR ("van than va snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu java java snippets ) or ( van than va snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu java java snippets") or ("van than va snippets"))) or ("locating bug code snippets"))*.