Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hanh dat slippers" » "van thanh dat slippers", "ban hanh dat slippers", "van anh dat slippers", "van hanh cat slippers", "van hanh dat slippery", "van hanh 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 hanh 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 hanh dat slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hanh dat slippers ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hanh dat slippers") or ("python using java snippets"))) or ("locating bug code snippets"))*.