Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
mot chieu » ho chieu
doi chieu » doc hieu, doi chi, ho chieu
tranh cua » doanh cua, manh cua
dung cong » dung trong
bai toan » bai tap
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: ((mot chieu) or (doi chieu)) sach - canh tranh cua ((nhung cong) OR (dung cong)) bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (doi chieu)) sach - canh tranh cua ((nhung cong) OR (dung cong)) bai toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (doi chieu)) sach - canh tranh cua ((nhung cong) OR (dung cong)) bai toan cau*".