Perhaps you should try some spelling variations:
hien manh » hien hanh, tien manh, hieu manh
dung cong » dung trong
cong lang » cong vang, cong luong, cong quang
chinh ve » chinh va, chinh vi, chinh ke
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
ve dung » ve duong, ve rung, va dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien manh - hanh chinh ve dung cong lang ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - hanh chinh ve dung cong lang ((toan cau) OR (toan cao))*.