Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van thao he snippets" » "van tham he snippets", "van hao he snippets", "van than he snippets", "van tao he snippets", "van thao hoc snippets", "van thao h.t snippets"
"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 thao he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van thao he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van thao he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van thao he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.