Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"xang dau hoc snippets" » "hang dau hoc snippets", "xang dai hoc snippets", "xang du hoc snippets", "xang dan hoc 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: (((("xang dau hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("xang dau hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( xang dau hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("xang dau hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.