Perhaps you should try some spelling variations:
thuyet anh » thuyet kinh, thuy anh, thuyet dan
thong cong » trong cong, tong cong, thong thong
thiet anh » thien anh, thien danh, thich anh
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: toan ((thiet anh) OR (thuyet anh)) - canh tranh va thong cong dan than tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toan ((thiet anh) OR (thuyet anh)) - canh tranh va thong cong dan than tap".
• Adding a wildcard symbol may retrieve word variants: toan ((thiet anh) OR (thuyet anh)) - canh tranh va thong cong dan than tap*.