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
nhanh bac » nhanh va
nhanh ha » thanh hoa, thanh hai, khanh hoa

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 ((nhanh bac) OR (nhanh ha))~.
• 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 ((nhanh bac) OR (nhanh ha)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chinh sach) or (hieu lang)) - hanh trang cua cong thong dan ((nhanh bac) OR (nhanh ha))".
• Adding a wildcard symbol may retrieve word variants: doi ((chinh sach) or (hieu lang)) - hanh trang cua cong thong dan ((nhanh bac) OR (nhanh ha))*.