Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
cua phuong » cuu phuong, cuc phuong, luan phuong
hanh dung » thanh dung, anh dung, hanh dong
dung cua » dung luan, dung cho
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
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 tinh) or (chieu sach)) - hanh dung cua phuong cong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu tinh) OR (chieu sach)) - hanh dung cua phuong cong bai toan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu tinh) or (chieu sach)) - hanh dung cua phuong cong bai toan cau*.