Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, manh trung, danh trung
hanh trang » thanh trung, canh tranh, hanh trinh
hoc chieu » hoc thieu, ho chieu, hoc hien
dung manh » duong manh, dung danh, hung manh
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
cua ung » cua rung, cua ong, cua nhung

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - ((hanh trung) OR (hanh trang)) cua ung dung manh ((toan cau) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - ((hanh trung) or (hanh trang)) cua ung dung manh ((toan cau) OR (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - ((hanh trung) or (hanh trang)) cua ung dung manh ((toan cau) OR (toan cao))*.