Perhaps you should try some spelling variations:
"hoc thieu trinh snippets" » "hoc tieu trinh snippets", "hoc trieu tinh snippets", "hoc tien trinh snippets", "toc thieu trinh snippets", "hoc hien trinh snippets", "hoc thieu trinh slippers"
"dung cho code snippets" » "dung cho cong snippets", "dung cfd code snippets", "dung cho con snippets", "dung cho code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("hoc thieu trinh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc thieu trinh snippets") OR ("dung cho code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc thieu trinh snippets ) or ( dung cho code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc thieu trinh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))*.