Perhaps you should try some spelling variations:
"thi thanh may tinh pc." » "thi thanh tay tinh pc.", "thi hanh may tinh pc.", "thi thanh mau tinh pc.", "thi thanh may trinh plc.", "thi thanh may tinh hoc.", "thi thanh may tinh phu."
"thep dinh van hinh hoc." » "thep hinh van hinh hoc.", "tham dinh van hinh hoc.", "hiep dinh van hinh hoc.", "thep dinh van chinh hoc.", "thep dinh van thinh hoc.", "thep dinh van minh hoc.", "thep dinh van sinh hoc.", "thep dinh van tin hoc.", "thep dinh van benh hoc."
"thi hanh dac tinh f.c." » "thi hanh cac tinh f.c.", "thi hanh dao tinh f.c.", "thi thanh dat tinh f.c.", "thi hanh ha tinh f.c.", "thi hanh ban tinh f.c.", "thi hanh dac tinh hoc.", "thi hanh dac tinh bac.", "thi hanh dac tinh duc."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("thi thanh may tinh pc.") or ("thi hanh dac tinh f.c."))) or ("thep dinh van hinh hoc."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi thanh may tinh pc.") OR ("thi hanh dac tinh f.c."))) OR ("thep dinh van hinh hoc.")).
• Removing quotes may allow a broader search: (((( thi thanh may tinh pc. ) or ( thi hanh dac tinh f.c. ))) or ( thep dinh van hinh hoc. )).
• Adding a wildcard symbol may retrieve word variants: (((("thi thanh may tinh pc.") or ("thi hanh dac tinh f.c."))) or ("thep dinh van hinh hoc."))*.