Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van duong bo snippets" » "van dong bo snippets", "van dung bo snippets", "van phong bo snippets", "van duong co snippets", "van duong o snippets", "van truong bo 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 duong bo 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 duong bo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van duong bo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van duong bo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.