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