Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu sach » chinh sach, chiet tach, chieu sang
cong thong » cong thuong, cong trong, dong thong
dien thanh » tien thanh, dinh thanh, de thanh
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luat, trinh quan
den thanh » de thanh, dinh thanh, dong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (hieu lang)) - hanh trinh cua cong thong ((dien thanh) OR (den thanh)) bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (hieu lang)) - hanh trinh cua cong thong ((dien thanh) OR (den thanh)) bac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (hieu lang)) - hanh trinh cua cong thong ((dien thanh) OR (den thanh)) bac".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (hieu lang)) - hanh trinh cua cong thong ((dien thanh) OR (den thanh)) bac*.