Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
thong cua » thong quan, thong tu, huong cua
tang luan » dung luan
hang cong » dang cong, hang nong, bang cong
hach toan » thanh toan, manh toan
theo cau » theo chu, theo cap, theo dau
cau sach » cao sach, hau sach, rau sach
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: theo cau sach - hanh ((thong cua) or (tang luan)) ((nhung cong) OR (hang cong)) hach toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo cau sach - hanh ((thong cua) OR (tang luan)) ((nhung cong) OR (hang cong)) hach toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo cau sach - hanh ((thong cua) or (tang luan)) ((nhung cong) OR (hang cong)) hach toan cau".
• Adding a wildcard symbol may retrieve word variants: theo cau sach - hanh ((thong cua) or (tang luan)) ((nhung cong) OR (hang cong)) hach toan cau*.