Perhaps you should try some spelling variations:
dung truong » duong truong, dung trong, dung trung
canh trinh » canh tranh, hanh trinh, canh tinh
dung luong » dung thuong, dung phuong, dung trong
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
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: ((doi chieu) or (hoc thieu)) sach - canh trinh va ((dung luong) OR (dung truong)) nin toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) sach - canh trinh va ((dung luong) OR (dung truong)) nin toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (hoc thieu)) sach - canh trinh va ((dung luong) OR (dung truong)) nin toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) sach - canh trinh va ((dung luong) OR (dung truong)) nin toan cau*.