Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nen tang moi snippets" » "le tang moi snippets", "nen mong moi snippets", "nen van moi snippets", "nen tang loi snippets", "nen thanh moi snippets", "nen trong moi 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: (((("nen tang moi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nen tang moi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nen tang moi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nen tang moi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.