Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh trinh » canh tranh, hanh chinh
trinh suat » trinh luat, trinh sat, trinh quan
luong cong » dung cong, trong cong, tong cong
cong cong » cong dong, trong cong, dung cong
toan ban » van ban

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: theo ((chieu sach) OR (chieu sang)) - hanh trinh suat ((luong cong) OR (cong cong)) tinh toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (chieu sang)) - hanh trinh suat ((luong cong) OR (cong cong)) tinh toan ban~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chieu sang)) - hanh trinh suat ((luong cong) OR (cong cong)) tinh toan ban*.