Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
cong lang » cong vang, cong luong, cong quang
lang phan » nang phan, lang thang, lang phong
cong tac » cong ty
tac dung » sach dung, xay dung, tin dung
phan dau » phan tu, hang 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)) sach - thanh cong tac dung cong lang phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (toc thieu)) sach - thanh cong tac dung cong lang phan dau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (toc thieu)) sach - thanh cong tac dung cong lang phan dau*.