Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » thong cong, hang cong, nhung don
hanh dong » anh dong, ha dong
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
dong va » dung va, dong ha, luong va

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

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