Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van han canh snippets" » "van van canh snippets", "van han danh snippets", "van dan canh snippets", "van hanh canh snippets", "van phan canh snippets", "van nhan canh 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 han canh 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 han canh snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van han canh snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van han canh snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.