Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nhanh lang » nhanh quang, nhanh thang, nhan dang
tong cong » trong cong, cong cong, dung cong
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau
toan cao » toan ban, toan tap
va tong » va thong, va tuong, va trong

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 - ((nhanh lang) or (canh tranh)) va tong cong tan ((tran cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((nhanh lang) OR (canh tranh)) va tong cong tan ((tran cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((nhanh lang) or (canh tranh)) va tong cong tan ((tran cau) or (toan cao))*.