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