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
ganh nang » anh nang, nganh nong, van nang
nang dua » nang du, nang suat, nang quan
tran cau » tran chau, toan cau, ran cau

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 - ganh nang dua ((nhung cong) or (trong cong)) tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ganh nang dua ((nhung cong) OR (trong cong)) tan tran cau.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ganh nang dua ((nhung cong) or (trong cong)) tan tran cau*.