Perhaps you should try some spelling variations:
tranh thuat » trong thuat, tranh chua, tranh thai
nhung cong » thong cong, hang cong, nhung don
doi chieu » doi chi, mot chieu, ho chieu
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
tac hang » tac vang, bac thang, tac chong
hang cau » hang dau, hang ca, nhung cau

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 (doc hieu)) sach - canh tranh thuat ((nhung cong) or (dung cong)) tac hang cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - canh tranh thuat ((nhung cong) OR (dung cong)) tac hang cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - canh tranh thuat ((nhung cong) or (dung cong)) tac hang cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) sach - canh tranh thuat ((nhung cong) or (dung cong)) tac hang cau*.