Perhaps you should try some spelling variations:
hanh trang » thanh trung, hanh trinh, minh trang
luan thong » luan phong, luan tuong, luat thong
thong cong » trong cong, tong cong, thong thong
doc hieu » hoc thieu, hoc hien
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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) OR (toc thieu)) sach - ((hanh trang) or (canh tranh)) luan thong cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) sach - ((hanh trang) OR (canh tranh)) luan thong cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (toc thieu)) sach - ((hanh trang) or (canh tranh)) luan thong cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (toc thieu)) sach - ((hanh trang) or (canh tranh)) luan thong cong san toan cau*.