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