Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
dua nhung » cua nhung, du nhung, qua nhung
doi chieu » doc hieu, ho chieu, mot chieu
anh nang » ganh nang, anh bang, anh dang
nang dua » nang du, nang suat, nang quan
dan than » dan chan, ban than, van than
doi chi » doi khi

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 (doi chi)) sach - anh nang dua nhung cong ((xuan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - anh nang dua nhung cong ((xuan toan) OR (dan than)) cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) sach - anh nang dua nhung cong ((xuan toan) or (dan than)) cau*.