Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"bieu toan ve snippets" » "hieu toan ve snippets", "kiem toan ve snippets", "bien soan ve snippets", "bieu toan va snippets", "bieu toan ke snippets", "bieu toan von 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: (((("bieu toan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("bieu toan ve snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( bieu toan ve snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("bieu toan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.