Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"bach doan o snippets" » "bach dan o snippets", "hach toan o snippets", "bac dan o snippets", "bach doan do snippets", "bach doan _ snippets", "bach toan o 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: (((("bach doan o snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("bach doan o snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( bach doan o snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("bach doan o snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.