Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
duong manh » duong van
trang cua » tranh cua, tang cua, trung cua
trung cap » truong cao, trung tam
tung manh » hung manh, luong manh, nhung manh
ho chieu » theo chieu, hoc thieu, doi chieu
toan cau » toan cao, toan ban, toan tap

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: ho chieu sach - hanh ((trang cua) OR (trung cap)) han ((tung manh) OR (duong manh)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((trang cua) or (trung cap)) han ((tung manh) OR (duong manh)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trang cua) or (trung cap)) han ((tung manh) OR (duong manh)) toan cau*.