Perhaps you should try some spelling variations:
thiet danh » thien anh, thien dang, tiep danh
thien danh » thien anh, thien dang, thien thanh
luan nhung » luan chung, luan hung, quan nhung
nhung cong » dung cong, thong cong, hang cong
tang luan » dung luan
anh tang » anh bang, anh dang, anh nang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh 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: hoc ((thiet danh) OR (thien danh)) - anh tang luan nhung cong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet danh) OR (thien danh)) - anh tang luan nhung cong dan toan cau*".