Perhaps you should try some spelling variations:
phuong manh » phuong anh, phung manh, phuong danh
dung phuong » dung thuong, bang phuong, dung chung
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
trinh vat » trinh van, trinh luat, sinh vat
manh toan » thanh toan, anh tuan, tinh toan
trinh va » trinh van, trinh ve, trinh vi
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 ((trinh va) OR (trinh vat)) dung phuong manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu tinh) OR (chieu sach)) - hanh ((trinh va) OR (trinh vat)) dung phuong manh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu tinh) or (chieu sach)) - hanh ((trinh va) OR (trinh vat)) dung phuong manh toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu tinh) or (chieu sach)) - hanh ((trinh va) OR (trinh vat)) dung phuong manh toan cau*.