Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
cong thang » cong thanh, cong thong, cung thang
cang thang » cong thanh, dang thanh
canh manh » lanh manh, canh tranh, cach mang
manh cua » doanh cua, ban cua
ban hanh » ban hang

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 - canh manh cua cong ((cong thang) or (cang thang)) ban hanh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - canh manh cua cong ((cong thang) OR (cang thang)) ban hanh*.