Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh trinh » canh tranh, hanh chinh
trinh van » trinh han, trinh quan, trinh toan
cong thuc » cong tac
van dung » van dong, xay dung, tin dung
cong huu » cong chuc, duong huu, cong hung
tuan ban » tuan bang, toan ban, luan 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: ho ((chieu sach) OR (chiet tach)) - hanh trinh van dung ((cong huu) OR (cong thuc)) tuan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (chiet tach)) - hanh trinh van dung ((cong huu) OR (cong thuc)) tuan ban~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chiet tach)) - hanh trinh van dung ((cong huu) OR (cong thuc)) tuan ban*.