Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van vinh dat slippers" » "van minh dat slippers", "van dinh dat slippers", "van binh dat slippers", "van chinh dat slippers", "van dinh doat slippers", "van vinh dat slippery", "van vinh dat 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 vinh dat 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 vinh dat slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van vinh dat slippers ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van vinh dat slippers") or ("python using java snippets"))) or ("locating bug code snippets"))*.