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