Perhaps you should try some spelling variations:
thien danh » thien dang, thien thanh, thien chanh
nhung cong » dung cong, thong cong, hang cong
thien anh » tien anh, thien thanh, thien chanh
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
trang va » hang va
tran van » luan van
toan cau » toan cao, toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (thien danh)) - hanh ((trang va) OR (tran van)) nhung cong manh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) OR (thien danh)) - hanh ((trang va) or (tran van)) nhung cong manh toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) OR (thien danh)) - hanh ((trang va) or (tran van)) nhung cong manh toan cau*.