Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu he cong snippets" » "thu che cong snippets", "thu te cong snippets", "thu ve cong snippets", "thu ha cong snippets", "thu xe cong snippets", "thu hien cong 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 he cong 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 he cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu he cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu he cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.