Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van dung o2 snippets" » "van dong o2 snippets", "xay dung o2 snippets", "tin dung o2 snippets", "van dung o snippets", "van dung von snippets", "van dung doi 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 dung o2 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 dung o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van dung o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van dung o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.