Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh quan » tinh quang, trinh luat, trinh han
trinh cua » tinh cua, trinh luat, trinh luan
nhung don » nhung van, nhung bo
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
tan toan » tan tran, tap toan, van toan
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 ((trinh cua) OR (trinh quan)) ((nhung don) OR (dung cong)) tan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((trinh cua) OR (trinh quan)) ((nhung don) or (dung cong)) tan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trinh cua) OR (trinh quan)) ((nhung don) or (dung cong)) tan toan cau*.