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