Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
cong thong » cong thuong, cong trong, dong thong
hieu lang » chieu sang, hieu quang, nhieu tang
trang cua » tranh cua, tang cua, trung cua
thong dan » thong van, tuong dan, thong den
dan hanh » dang hanh, dan khanh, dan thanh
hanh bac » nhanh bac, thanh bac, hanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chinh sach) or (hieu lang)) - hanh trang cua cong thong dan hanh bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chinh sach) OR (hieu lang)) - hanh trang cua cong thong dan hanh bac.
• Adding a wildcard symbol may retrieve word variants: doi ((chinh sach) or (hieu lang)) - hanh trang cua cong thong dan hanh bac*.