Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
chieu sang » chieu sach, chieu xanh, nhieu tang
trung cong » truong cong, trung uong, trang cong
hieu lang » hieu quang, nhieu tang, hieu van
trang cua » tranh cua, tang cua, trung cua
van tuan » van quan, van ban, anh tuan
tuan cau » toan cau, quan cau, tuan cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (chieu sang)) - hanh trang cua ((trung cong) OR (trong cong)) van tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (chieu sang)) - hanh trang cua ((trung cong) OR (trong cong)) van tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) or (chieu sang)) - hanh trang cua ((trung cong) OR (trong cong)) van tuan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (chieu sang)) - hanh trang cua ((trung cong) OR (trong cong)) van tuan cau*.