Perhaps you should try some spelling variations:
nhung cuong » nhung cong, hung cuong, nhung chong
chieu sach » chinh sach, chiet tach, chieu sang
chinh sua » chinh su, chinh cua, chinh luan
ho chieu » theo chieu, hoc thieu, doi chieu
tinh cua » trinh cua, sinh cua, tinh chat
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((tinh cua) OR (chinh sua)) nhung cuong ((tap toan) OR (tap quan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((tinh cua) or (chinh sua)) nhung cuong ((tap toan) OR (tap quan)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((tinh cua) or (chinh sua)) nhung cuong ((tap toan) OR (tap quan)) cao*.