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