Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
theo dien » theo tieu, thu dien, tro dien
thuy dien » thu dien, thuat dien, chua dien
anh mang » hanh mang, anh bang, anh dang
cong san » cong tac
toan cao » toan ban, toan tap
mang va » mang vua, hang va, bang va

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) OR (thuy dien)) sach - anh mang va nhung ((cong san) or (cong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo dien) OR (thuy dien)) sach - anh mang va nhung ((cong san) OR (cong thanh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo dien) OR (thuy dien)) sach - anh mang va nhung ((cong san) or (cong thanh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo dien) OR (thuy dien)) sach - anh mang va nhung ((cong san) or (cong thanh)) toan cao*.