Perhaps you should try some spelling variations:
trinh cuong » trinh chuong, trinh cong, trinh duong
canh trinh » canh tranh, hanh trinh, canh tinh
cuong dung » tuong duong, ung dung, thong dung
dung cong » dung trong
doi hieu » doi chieu, doi hien, hoi hieu
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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 hieu) OR (doc hieu)) quang - canh trinh cuong dung cong tac toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi hieu) OR (doc hieu)) quang - canh trinh cuong dung cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: ((doi hieu) OR (doc hieu)) quang - canh trinh cuong dung cong tac toan cao*.