Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh nhan » thanh nhan, danh nhan, anh nhan
cua nhung » va nhung
cong tap » cuong tap, cong tan, tong tap
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap

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