Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
nhan dang » nhan dan, phan dang, tran dang
cua nhung » va nhung
cong tac » cong ty
vang cau » van cau, bang cau, nang cau
hang cau » hang dau, hang ca, nhung cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - ((hanh trang) or (nhan dang)) cua nhung cong tac ((vang cau) OR (hang cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((hanh trang) OR (nhan dang)) cua nhung cong tac ((vang cau) OR (hang cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((hanh trang) or (nhan dang)) cua nhung cong tac ((vang cau) OR (hang cau))".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((hanh trang) or (nhan dang)) cua nhung cong tac ((vang cau) OR (hang cau))*.