Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
theo dien » theo tieu, thu dien, thuy dien
dien sach » dien anh
anh mang » hanh mang, anh bang, anh dang
cong tan » cong tac, cong san, cong ty
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 sach - anh mang va nhung ((cong tan) or (cong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo dien sach - anh mang va nhung ((cong tan) OR (cong thanh)) toan cao.
• Adding a wildcard symbol may retrieve word variants: theo dien sach - anh mang va nhung ((cong tan) or (cong thanh)) toan cao*.