Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phong thi he snippets" » "phuong thi he snippets", "phung thi he snippets", "phong tri he snippets", "phong thi hue snippets", "phong thi hoe snippets", "phong thi ha 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: (((("phong thi 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: (((("phong thi he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phong thi he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phong thi he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.