Perhaps you should try some spelling variations:
trinh cong » trinh dung
toan trinh » thanh trinh, trang trinh, toan tin
khong khi » khong he
cong thai » cong hai, hong thai, cong thanh
sach han » sach tham, sach danh, sach nang
cong khi » co khi, cong ha, cong hai
te sach » toc sach

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach han ((cong khi) OR (khong khi)) đong luc ) OR ( thuat toan trinh cong thai đong luc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach han ((cong khi) OR (khong khi)) đong luc ) or ( thuat toan trinh cong thai đong luc ))~".
• Adding a wildcard symbol may retrieve word variants: (( te sach han ((cong khi) OR (khong khi)) đong luc ) or ( thuat toan trinh cong thai đong luc ))*.