Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu lang » chieu sang, hieu quang, nhieu tang
trang cua » tranh cua, tang cua, trung cua
dung cong » dung trong
cong danh » cuong danh, cong dan, cong thanh
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dung » cua dang, cua dong, qua dung
tuan ban » tuan bang, luan ban, quang ban
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 cua dung cong danh ((tuan ban) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh trang cua dung cong danh ((tuan ban) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trang cua dung cong danh ((tuan ban) or (toan ban))*.