Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
cong phap » chong phap, cong phan, cong pham
phap phan » phap phat, phap hoan, phap luan
dan dung » van dung, tin dung, ap dung
lua dang » cua dang, luan nang, luan danh
lua sang » luc sang, bua sang, cua sang
phan lap » phan dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (toc thieu)) sang - dan dung ((lua dang) OR (lua sang)) cong phap phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sang - dan dung ((lua dang) OR (lua sang)) cong phap phan lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (toc thieu)) sang - dan dung ((lua dang) OR (lua sang)) cong phap phan lap".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) sang - dan dung ((lua dang) OR (lua sang)) cong phap phan lap*.