Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc hien so snippets" » "duc chien so snippets", "duc thien so snippets", "duc tien so snippets", "duc khien so snippets", "duc bien so snippets", "duc hieu so 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 hien so 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 hien so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc hien so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc hien so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.