Perhaps you should try some spelling variations:
danh trung » dang trung, dinh trung, manh trung
doi chieu » doc hieu, doi chi, mot chieu
manh tung » manh hung, thanh tung
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, mot chieu
qua dung » quang dung, su dung, qua song
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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 - ((danh trung) or (manh tung)) qua dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - ((danh trung) OR (manh tung)) qua dung cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) sach - ((danh trung) or (manh tung)) qua dung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) sach - ((danh trung) or (manh tung)) qua dung cong tac toan cau*.