Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien danh
chieu sang » chieu sach, chieu xanh, hieu lang
thien anh » thien danh, tien anh, thien thanh
thong dan » thong van, tuong dan, thong den
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
dan toan » van toan, dan than, manh toan
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: hoc ((((thieu xanh) OR (thien anh))) or (chieu sang)) - canh tranh va thong thong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((thieu xanh) OR (thien anh))) OR (chieu sang)) - canh tranh va thong thong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((thieu xanh) OR (thien anh))) or (chieu sang)) - canh tranh va thong thong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((((thieu xanh) OR (thien anh))) or (chieu sang)) - canh tranh va thong thong dan toan cao*.