Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van giang vo snippets" » "manh giang vo snippets", "tran giang vo snippets", "dan gian vo snippets", "van giang o snippets", "van giang ve snippets", "van giang van 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 giang vo 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 giang vo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van giang vo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van giang vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.