Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu cua toi snippets" » "ngu ca toi snippets", "ngu cu toi snippets", "ngu cua hoi snippets", "ngu cua moi snippets", "ngu cua loai 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: (((("ngu cua toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu cua toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu cua toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu cua toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.