Perhaps you should try some spelling variations:
cong luong » cong thuong, nang luong, cong dong
hieu tinh » chieu tinh, kieu tinh, hieu binh
lieu tinh » trieu tinh, diep tinh, bien tinh
hanh dung » thanh dung, hanh dong, manh dung
luan cong » luat cong, luong cong, luan chung
luong dan » huong dan, luong dao, luong van
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) or (lieu tinh)) - ((hanh dung) OR (anh dung)) luan cong luong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (lieu tinh)) - ((hanh dung) OR (anh dung)) luan cong luong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu tinh) or (lieu tinh)) - ((hanh dung) OR (anh dung)) luan cong luong dan than cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu tinh) or (lieu tinh)) - ((hanh dung) OR (anh dung)) luan cong luong dan than cau*.