Perhaps you should try some spelling variations:
thuyet anh » thuyet kinh, thuy anh, thuyet dan
thiet anh » thien anh, thien danh, thich anh
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
manh toan » thanh toan, tinh toan
tran van » luan van
van dung » van dong, xay dung, tin dung

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 ((thiet anh) OR (thuyet anh)) - hanh tran van dung cong ((manh toan) OR (anh tuan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet anh) OR (thuyet anh)) - hanh tran van dung cong ((manh toan) or (anh tuan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet anh) OR (thuyet anh)) - hanh tran van dung cong ((manh toan) or (anh tuan)) cau*.