Perhaps you should try some spelling variations:
canh trinh » canh tranh, canh tinh, anh trinh
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
hieu xanh » hieu manh, hieu nganh, dieu hanh
vat thong » va thong, vat trong, mat thong
dan thanh » dang thanh, danh thanh, ban thanh
thanh lap » thanh san, phan lap, thanh hai
cong dan » cong san, cong tan, huong dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) OR (chieu xanh)) - ((canh trinh) or (hanh trinh)) vat thong cong dan thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - ((canh trinh) OR (hanh trinh)) vat thong cong dan thanh lap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (chieu xanh)) - ((canh trinh) or (hanh trinh)) vat thong cong dan thanh lap*".