Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
doi chieu » doc hieu, ho chieu, mot chieu
dung cong » dung trong
mang cua » manh cua, dung cua, ban cua
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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 (doi chi)) sach - cach mang cua ((nhung cong) OR (dung cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - cach mang cua ((nhung cong) OR (dung cong)) tac toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doi chi)) sach - cach mang cua ((nhung cong) OR (dung cong)) tac toan cau*".