Perhaps you should try some spelling variations:
thuong luan » thuong lan, truong luan, thuong luong
hanh tranh » hanh trinh, hanh trang, lanh tranh
thong luan » thong quan, tong luan, thong xuan
hieu sach » chieu sach, hieu cach, dien sach
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - ((hanh tranh) or (canh tranh)) cua nhung ((thuong luan) OR (thong luan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - ((hanh tranh) OR (canh tranh)) cua nhung ((thuong luan) OR (thong luan)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - ((hanh tranh) or (canh tranh)) cua nhung ((thuong luan) OR (thong luan)) van ban".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - ((hanh tranh) or (canh tranh)) cua nhung ((thuong luan) OR (thong luan)) van ban*.