Perhaps you should try some spelling variations:
thanh duong » thanh huong, thanh cuong, thanh vuong
thong cong » trong cong, tong cong, thong thong
tieu xanh » tieu danh, chieu xanh, dieu hanh
va thong » va thuong, va phuong, he thong
cong tan » cong tac, cong san, cong thanh
tran tap » toan tap, tran tan, tran tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu xanh - ((sach dung) or (thanh duong)) va thong cong tan tran tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - ((sach dung) OR (thanh duong)) va thong cong tan tran tap.
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - ((sach dung) or (thanh duong)) va thong cong tan tran tap*.