Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu thiem so snippets" » "thua thien so snippets", "thu nghiem so snippets", "thua thiet so snippets", "thu thieu so snippets", "thu thien su snippets", "thu hiem o 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: (((("thu thiem 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: (((("thu thiem so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu thiem so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu thiem so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.