Perhaps you should try some spelling variations:
chinh quan » chinh luan, chinh ngan, trinh quan
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
ho chiet » ho chieu, ho thiet, hoa thiet
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chiet) OR (hoc thiet)) tach - hanh ((chinh quan) or (chinh quyen)) nhung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chiet) OR (hoc thiet)) tach - hanh ((chinh quan) OR (chinh quyen)) nhung cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chiet) OR (hoc thiet)) tach - hanh ((chinh quan) or (chinh quyen)) nhung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chiet) OR (hoc thiet)) tach - hanh ((chinh quan) or (chinh quyen)) nhung cong tac toan cau*.