Perhaps you should try some spelling variations:
tranh quan » tranh quang, trinh quan, tranh luan
chieu xanh » chieu sach, chieu sang, chieu tinh
thong cong » trong cong, tong cong, phong chong
hieu xanh » hieu manh, hieu nganh, dieu hanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

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 tranh quan ((thong cong) or (thong thong)) tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - canh tranh quan ((thong cong) OR (thong thong)) tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (chieu xanh)) - canh tranh quan ((thong cong) or (thong thong)) tan toan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (chieu xanh)) - canh tranh quan ((thong cong) or (thong thong)) tan toan cau*.