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