Perhaps you should try some spelling variations:
"thi trinh han snippets" » "tho trinh han snippets", "thi thanh han snippets", "thi minh han snippets", "thi trinh quan snippets", "thi trinh han slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("thi trinh han snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi trinh han snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("thi trinh han snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.