Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
dung dang » dung dan, dung dong, dung danh
dang manh » dang hanh, dang minh, duong manh
cua dung » cua dang, cua dong, qua dung
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - ((hanh tranh) or (hanh trinh)) cua dung dang manh ((toan tap) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((hanh tranh) OR (hanh trinh)) cua dung dang manh ((toan tap) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((hanh tranh) or (hanh trinh)) cua dung dang manh ((toan tap) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((hanh tranh) or (hanh trinh)) cua dung dang manh ((toan tap) OR (toan ban))*.