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
cua nhung » va nhung
anh dung » anh dong, anh huong, sach dung
dung cua » dung luan, dung cho
tac tran » tan tran, tac trai, tac tren

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 - anh dung cua nhung cong ((tac tran) or (khac trai)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - anh dung cua nhung cong ((tac tran) OR (khac trai)) van.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - anh dung cua nhung cong ((tac tran) or (khac trai)) van*.