Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu sang » chieu sang, hieu lang, hieu quang
chua xang » chua nang, chuc nang, chua dong
doc hieu » toc thieu, hoc thieu, hoc hien
chu bang » thu bang, chuc nang, chu quang
cong ban » cong bang, cong san, cong tan
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sang - hanh trang ((chua xang) OR (chu bang)) cong ban ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - hanh trang ((chua xang) OR (chu bang)) cong ban ((than cau) OR (toan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sang - hanh trang ((chua xang) OR (chu bang)) cong ban ((than cau) or (toan cau))".
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - hanh trang ((chua xang) OR (chu bang)) cong ban ((than cau) or (toan cau))*.