Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van dung lon snippets" » "van dong lon snippets", "xay dung lon snippets", "tin dung lon snippets", "van dung con snippets", "van dung len snippets", "van dung hon 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 dung lon 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 dung lon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van dung lon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van dung lon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.