Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
trang tuan » tran tuan, trung tuan, trong tuan
hieu lang » chieu sang, hieu quang, nhieu tang
tuan hung » tran hung, luan hung, tuan dung
hoc hieu » hoc thieu, hoc hien, doc hieu
cong san » cong tac
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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 - hanh trang tuan hung ((cong san) or (cong trinh)) ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh trang tuan hung ((cong san) OR (cong trinh)) ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh trang tuan hung ((cong san) or (cong trinh)) ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trang tuan hung ((cong san) or (cong trinh)) ((toan cau) OR (toan ban))*.