Perhaps you should try some spelling variations:
chiet tach » chieu sach
phong cong » phong chong, thong cong, chong cong
trinh toan » tinh toan, thanh toan, trinh han
cach dung » cach mang, tac dung, anh dung
tong cong » trong cong, cong cong, dung cong
ho chiet » ho chieu, ho thiet, hoc thiet
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 chiet tach - ((cach dung) OR (sach dung)) luan ((phong cong) or (tong cong)) trinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - ((cach dung) OR (sach dung)) luan ((phong cong) OR (tong cong)) trinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - ((cach dung) OR (sach dung)) luan ((phong cong) or (tong cong)) trinh toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - ((cach dung) OR (sach dung)) luan ((phong cong) or (tong cong)) trinh toan cau*.