Perhaps you should try some spelling variations:
phuong duong » phuong dung, chuong duong, phuong dong
phuong luong » thuong luong, phuong dung, chuong duong
hanh dung » thanh dung, anh dung, hanh dong
doc hieu » toc thieu, hoc thieu
van than » van thanh, van thang, van tuan
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) OR (hoc hien)) tinh - hanh dung luan ((phuong luong) or (phuong duong)) van than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) tinh - hanh dung luan ((phuong luong) OR (phuong duong)) van than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (hoc hien)) tinh - hanh dung luan ((phuong luong) or (phuong duong)) van than cau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (hoc hien)) tinh - hanh dung luan ((phuong luong) or (phuong duong)) van than cau*.