Perhaps you should try some spelling variations:
luan trong » quan trong, luat trong, luan tuong
thiet danh » thien danh, thien dang, tiep danh
thien anh » thien danh, tien anh, thien thanh
tang luan » dung luan
anh tang » anh bang, anh dang, anh nang
cong van » cong vang, cong san, song van
van tuan » van quan, van ban, anh tuan
tuan cao » toan cao, juan cao, quang cao

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 anh)) - anh tang luan trong cong van tuan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet danh) OR (thien anh)) - anh tang luan trong cong van tuan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet danh) or (thien anh)) - anh tang luan trong cong van tuan cao*.