Perhaps you should try some spelling variations:
"tham dinh van tinh f.c." » "thai binh van tinh f.c.", "than kinh van tinh f.c.", "pham minh van tinh f.c.", "tham sinh vat tinh f.c.", "tham dinh van thinh f.c.", "tham dinh van minh f.c.", "tham dinh ban tinh f.c.", "tham dinh van tinh hoc.", "tham dinh van tinh bac.", "tham dinh van tinh duc."
"thep dinh may tinh f.c." » "thep hinh may tinh f.c.", "hiep dinh may tinh f.c.", "phap dinh may tinh f.c.", "thep dinh may tinh hoc.", "thep dinh may tinh bac.", "thep dinh may tinh duc.", "thep trinh may tinh f.c.", "thep dinh moi tinh f.c.", "thep dinh lam tinh f.c."
"nam dinh ban hanh f.c." » "nam dinh bang hanh f.c.", "nam dinh ba hanh f.c.", "nam sinh ban hanh f.c.", "nam dinh ban hang f.c.", "nam dinh ban hanh cac."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("tham dinh van tinh f.c.") or ("nam dinh ban hanh f.c."))) or ("thep dinh may tinh f.c."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tham dinh van tinh f.c.") OR ("nam dinh ban hanh f.c."))) OR ("thep dinh may tinh f.c."))*.
• Removing quotes may allow a broader search: (((( tham dinh van tinh f.c. ) or ( nam dinh ban hanh f.c. ))) or ( thep dinh may tinh f.c. ))*.