Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
canh trinh » canh tranh, hanh trinh, canh tinh
dung luong » dung thuong, dung truong, dung trong
doi chieu » doc hieu, doi chi, mot chieu
ho chieu » theo chieu, hoc thieu, mot chieu
trinh ve » trinh he, trinh va, trinh vi
nin toan » tinh toan
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: ((ho chieu) or (doi chieu)) sach - canh trinh ve ((dung luong) OR (dung phuong)) nin toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - canh trinh ve ((dung luong) OR (dung phuong)) nin toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) sach - canh trinh ve ((dung luong) OR (dung phuong)) nin toan cau*".