Perhaps you should try some spelling variations:
duong cong » luong cong, duong trong, trong cong
canh trinh » canh tranh, hanh trinh, canh tinh
lieu tinh » trieu tinh, diep tinh, bien tinh
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
co lieu » cot lieu, co hieu, so lieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: co lieu tinh - canh trinh va ((duong cong) OR (dung cong)) dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co lieu tinh - canh trinh va ((duong cong) OR (dung cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: co lieu tinh - canh trinh va ((duong cong) OR (dung cong)) dan toan cao*.