Perhaps you should try some spelling variations:
phuong cong » phong cong, phung cong, phuong hoang
phuong dong » phuong dung, phuong hoang, chuong duong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh thang » nhanh thang, thanh thang, hanh trang
thang va » hang va, trang va, thong va
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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 thang va ((phuong cong) or (phuong dong)) ((tan toan) OR (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh thang va ((phuong cong) OR (phuong dong)) ((tan toan) OR (tap toan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh thang va ((phuong cong) or (phuong dong)) ((tan toan) OR (tap toan)) cau*".