Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong thi co snippets" » "duong thi co snippets", "dang thi co snippets", "dong tai co snippets", "dong thi mo snippets", "dong thi cu snippets", "dong thi bo 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: (((("dong thi co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong thi co snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong thi co snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong thi co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.