Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
cong ngang » cong nhan, cong quang, cong nong
hang hang » nang hang, cang thang, hung thang
va phuong » va thuong, cac phuong
cong lang » cong vang, cong luong, cong quang
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 - hang hang va phuong ((cong lang) or (cong ngang)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hang hang va phuong ((cong lang) OR (cong ngang)) toan cao.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hang hang va phuong ((cong lang) or (cong ngang)) toan cao*.