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