Perhaps you should try some spelling variations:
trung nhung » trong nhung, trung hung, trung ngung
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
anh quang » anh xquang, nhanh quang, tinh quang
anh quan » anh tuan, ban quan, anh nhan
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap

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 (mot chieu)) sach - ((anh quang) or (anh quan)) trung nhung cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (mot chieu)) sach - ((anh quang) OR (anh quan)) trung nhung cong tap toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (mot chieu)) sach - ((anh quang) or (anh quan)) trung nhung cong tap toan cao".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (mot chieu)) sach - ((anh quang) or (anh quan)) trung nhung cong tap toan cao*.