Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"toc giay du snippets" » "toc tay du snippets", "tac gia du snippets", "hoc giao du snippets", "toc giay da snippets", "toc giao duc snippets", "toc giap duc 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: (((("toc giay 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: (((("toc giay du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toc giay du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toc giay du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.