Perhaps you should try some spelling variations:
luan phuong » lan phuong, quang phuong, luat thuong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
hanh dung » thanh dung, hanh dong, manh dung
doc hieu » toc thieu, hoc thieu, hoc hien
anh dung » anh dong, anh huong, sach dung
dan than » dan chan, ban than, van than
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 tinh - ((hanh dung) OR (anh dung)) ((luan phuong) or (doan phuong)) huong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - ((hanh dung) OR (anh dung)) ((luan phuong) OR (doan phuong)) huong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu tinh - ((hanh dung) OR (anh dung)) ((luan phuong) or (doan phuong)) huong dan than cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - ((hanh dung) OR (anh dung)) ((luan phuong) or (doan phuong)) huong dan than cau*.