Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
theo dien » theo tieu, thu dien, thuy dien
dien sach » dien anh
trung cao » truong cao, trung cap, trung ca
cong vang » cong lang, cong quang, cong ngang
thanh cau » thanh chau, nhanh cau, thanh ca
thanh mau » hanh mau, thanh san, thanh hai
trung co » trung bo, trong co, truong cao

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 - thanh ((trung cao) or (trung co)) thong cong vang ((thanh cau) OR (thanh mau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo dien sach - thanh ((trung cao) OR (trung co)) thong cong vang ((thanh cau) OR (thanh mau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo dien sach - thanh ((trung cao) or (trung co)) thong cong vang ((thanh cau) OR (thanh mau))".
• Adding a wildcard symbol may retrieve word variants: theo dien sach - thanh ((trung cao) or (trung co)) thong cong vang ((thanh cau) OR (thanh mau))*.