Perhaps you should try some spelling variations:
thien chanh » thien thanh, thien chinh, hien hanh
thien danh » thien anh, thien dang, thien thanh
thanh tung » thanh cong
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
toan cao » toan tap
toan ban » van 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 ((thien danh) or (thien chanh)) - thanh tung cua dung cong manh ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (thien chanh)) - thanh tung cua dung cong manh ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) or (thien chanh)) - thanh tung cua dung cong manh ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (thien chanh)) - thanh tung cua dung cong manh ((toan cao) OR (toan ban))*.