Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
doi chieu » doc hieu, doi chi, mot chieu
thong cua » thong quan, thong tu, huong cua
tang luan » dung luan
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, hoc thieu, mot chieu
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 - hanh ((thong cua) or (tang luan)) hang cong trinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - hanh ((thong cua) OR (tang luan)) hang cong trinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) sach - hanh ((thong cua) or (tang luan)) hang cong trinh toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) sach - hanh ((thong cua) or (tang luan)) hang cong trinh toan cau*.