Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van luc cho snippets" » "van loc cho snippets", "van duc cho snippets", "van lu cho snippets", "van luc cao snippets", "van nuoc cho snippets", "van luat cho 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 luc cho 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 luc cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van luc cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van luc cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.