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