Perhaps you should try some spelling variations:
thiet danh » thien danh, thien anh, tiep danh
thien dang » thien bang, thien danh, thien nang
hanh trung » thanh trung, hanh trang, manh trung
huong manh » hung manh, luong manh, phuong danh
duong manh » duong van
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
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 dang)) - hanh trung cua nhung ((huong manh) or (duong manh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet danh) OR (thien dang)) - hanh trung cua nhung ((huong manh) OR (duong manh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet danh) OR (thien dang)) - hanh trung cua nhung ((huong manh) or (duong manh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet danh) OR (thien dang)) - hanh trung cua nhung ((huong manh) or (duong manh)) toan cao*.