Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trung » thanh trung, hanh trang, manh trung
theo dien » theo tieu, thu dien, thuy dien
dien sach » dien anh
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dung cong
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo dien sach - hanh trung cua ((nhung cong) or (tong cong)) dan ((toan tap) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo dien sach - hanh trung cua ((nhung cong) OR (tong cong)) dan ((toan tap) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo dien sach - hanh trung cua ((nhung cong) or (tong cong)) dan ((toan tap) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: theo dien sach - hanh trung cua ((nhung cong) or (tong cong)) dan ((toan tap) OR (toan ban))*.