Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tran » thanh trang, thanh toan, thanh tra
cuong cong » luong cong, duong cong, dung cong
cong cong » cong dong, trong cong, dung cong
khoan cam » khoa cam, phan cam, thuan cam
tran van » luan van
khoan va » doan va, khoa ma, nhan va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu xanh - thanh tran van ((cuong cong) OR (cong cong)) dan ((khoan cam) OR (khoan va))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu xanh - thanh tran van ((cuong cong) or (cong cong)) dan ((khoan cam) OR (khoan va))~".
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - thanh tran van ((cuong cong) or (cong cong)) dan ((khoan cam) OR (khoan va))*.