Perhaps you should try some spelling variations:
nhung thuong » nhung phuong, nhung huong, hang thuong
nhung tuong » nhung huong, nhung phuong, hung vuong
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
lan van » luan van, lang van, tan van

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 - ((hanh tranh) or (hanh trinh)) cua ((nhung thuong) OR (nhung tuong)) lan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh tranh) OR (hanh trinh)) cua ((nhung thuong) OR (nhung tuong)) lan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((hanh tranh) or (hanh trinh)) cua ((nhung thuong) OR (nhung tuong)) lan van ban".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((hanh tranh) or (hanh trinh)) cua ((nhung thuong) OR (nhung tuong)) lan van ban*.