Perhaps you should try some spelling variations:
hien hanh » dieu hanh
canh sinh » canh tinh, canh binh, tinh sinh
vat nhung » va nhung, vap nhung, ve nhung
vai nhung » va nhung, voi nhung, vap nhung
cong doan » cong dan, cong hoan, dong doanh
doan phan » doanh phan, toan phan, dan phan
phan cau » phan dau, phan cac, phan tu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - canh sinh ((vat nhung) OR (vai nhung)) cong doan phan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - canh sinh ((vat nhung) OR (vai nhung)) cong doan phan cau*.