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