Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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: hai ((hieu lang) OR (chieu sach)) - hanh trinh cua nhung cong ((tan toan) OR (tap toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hai ((hieu lang) or (chieu sach)) - hanh trinh cua nhung cong ((tan toan) OR (tap toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hai ((hieu lang) or (chieu sach)) - hanh trinh cua nhung cong ((tan toan) OR (tap toan)) cau*.