Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sach » chinh sach, chiet tach, chieu sang
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh hang » thanh hang, hang hang, hanh han
ca nhung » cua nhung, cam nhung, va nhung
hai toan » bai toan, hach toan, thai doan
hang ca » hang va, nang cao, hang tai
hai tan » hai van, 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: hoc ((hien xanh) OR (chieu sach)) - hanh hang ca nhung cong ((hai toan) OR (hai tan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (chieu sach)) - hanh hang ca nhung cong ((hai toan) OR (hai tan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu sach)) - hanh hang ca nhung cong ((hai toan) OR (hai tan)) cau*.