Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc thanh he snippets" » "duc thang he snippets", "duc tan he snippets", "de thanh he snippets", "duc thanh hue snippets", "duc thanh ha snippets", "duc thanh ve 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: (((("duc thanh he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc thanh he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc thanh he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc thanh he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.