Perhaps you should try some spelling variations:
hien hanh » dieu hanh
dung cong » dung trong
tien anh » tieng anh, tien manh, dien anh
chinh va » chinh ta, chinh tai, hanh va
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan
va dung » van dung, va duong, vat 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 hanh) or (tien anh)) - hanh chinh va dung cong ((tan toan) or (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (tien anh)) - hanh chinh va dung cong ((tan toan) OR (tap toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (tien anh)) - hanh chinh va dung cong ((tan toan) or (tap toan)) cau*.