Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nhan viem du snippets" » "nhan vien du snippets", "nhan viet du snippets", "khuan viem du snippets", "nhan diem du snippets", "nhan hiem du 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: (((("nhan viem du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhan viem du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhan viem du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhan viem du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.