Perhaps you should try some spelling variations:
"tro thi doan snippets" » "tro thi code snippets", "tro thai doan snippets", "tro thi hoan snippets", "tro thi loan snippets", "tao thi doan snippets", "tro tai doan snippets", "trong thi doan snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data 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: (((("python using java snippets") or ("tro thi doan snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("tro thi doan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( tro thi doan snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("tro thi doan snippets"))) or ("locating bug core snippets"))*.