Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
dung cua » dung cho
cong san » cong tac
chat cao » chat co, chat cho, chat bao
cay cao » chay cao, cay co, tay cao

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 ((dung cua) OR (dung luan)) nhung cong san ((cay cao) or (chat cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((dung cua) OR (dung luan)) nhung cong san ((cay cao) OR (chat cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh ((dung cua) OR (dung luan)) nhung cong san ((cay cao) or (chat cao))".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((dung cua) OR (dung luan)) nhung cong san ((cay cao) or (chat cao))*.