Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"toan van due snippets" » "tran van due snippets", "toan ban due snippets", "tan van due snippets", "toan van de snippets", "toan van duy snippets", "toan van 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: (((("toan van due snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toan van due snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toan van due snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toan van due snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.