Perhaps you should try some spelling variations:
thanh truong » thanh thuong, thanh tung, thanh huong
thanh trung » thanh tung
tong cong » trong cong, cong cong, dung cong
khoan cam » khoa cam, khoan va, phan cam
theo dau » theo mau, thau dau, te dau
dau sach » cau sach, dat sach, hau sach
cong tac » cong ty
khan cap » khan ap, than cap, phan cac
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo dau sach - ((thanh truong) or (thanh trung)) va tong cong tac ((khan cap) or (khoan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo dau sach - ((thanh truong) OR (thanh trung)) va tong cong tac ((khan cap) OR (khoan cam)).
• Adding a wildcard symbol may retrieve word variants: theo dau sach - ((thanh truong) or (thanh trung)) va tong cong tac ((khan cap) or (khoan cam))*.