Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
trang va » tran van, hang va
cong van » cong vang, cong san, song van
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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 (chieu sang)) - hanh trang va nhung cong van ((than cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chieu sang)) - hanh trang va nhung cong van ((than cau) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chieu sang)) - hanh trang va nhung cong van ((than cau) or (than cap))".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chieu sang)) - hanh trang va nhung cong van ((than cau) or (than cap))*.