Perhaps you should try some spelling variations:
trung phuong » truong phuong, rung phuong, thuong phuong
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
phuong dan » phuong danh, phuong doan, huong dan
cua trung » cua truong, xuan trung, cua nhung
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
dan toan » van toan, dan than, 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: theo ((toc sach) or (doc sach)) - ((hanh tranh) OR (hanh trang)) cua trung phuong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((toc sach) OR (doc sach)) - ((hanh tranh) OR (hanh trang)) cua trung phuong dan toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((toc sach) or (doc sach)) - ((hanh tranh) OR (hanh trang)) cua trung phuong dan toan cau*".