Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hieu manh » chieu xanh, hieu nganh, dieu hanh
thien anh » thien danh, tien anh, thien thanh
tranh cuu » tranh cua, trinh cuu, tranh chua
cong danh » cuong danh, cong dan, cong khanh
cuu nong » cuu cong, cuu nang, cuu tong
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (thien anh)) - canh tranh cuu nong ((cong danh) OR (cong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien anh)) - canh tranh cuu nong ((cong danh) OR (cong thanh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (thien anh)) - canh tranh cuu nong ((cong danh) OR (cong thanh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (thien anh)) - canh tranh cuu nong ((cong danh) OR (cong thanh)) toan tap*.