Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java code slippers"
"van ngoc code snippets" » "van ngoc de snippets", "tran ngoc code snippets", "van hoc code snippets", "van nghe code snippets", "van ngoc code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("using java code snippets") or ("van ngoc code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("van ngoc code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( van ngoc code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("van ngoc code snippets"))) or ("locating bug code snippets"))*.