Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van ngoc voi snippets" » "tran ngoc voi snippets", "van hoc voi snippets", "van nghe voi snippets", "van ngoc hoi snippets", "van ngoc khoi snippets", "van ngoc hai 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 voi 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 voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van ngoc voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van ngoc voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.