Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van nhat cho snippets" » "van chat cho snippets", "van phat cho snippets", "van nhan cho snippets", "van nhat co snippets", "van nhat nheo 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 nhat 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 nhat cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van nhat cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van nhat cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.