Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
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
tac vang » cac van, tac dung, tac dong
vang cau » hang cau, van cau, bang 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) OR (chinh sach)) - ((hanh trang) or (nhan dang)) cua nhung cong tac vang cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chinh sach)) - ((hanh trang) OR (nhan dang)) cua nhung cong tac vang cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chinh sach)) - ((hanh trang) or (nhan dang)) cua nhung cong tac vang cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chinh sach)) - ((hanh trang) or (nhan dang)) cua nhung cong tac vang cau*.