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 » bi tinh, yen tinh, diep 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

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) OR (bien tinh)) - canh trinh va ((duong cong) or (dung cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((lieu tinh) OR (bien 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) OR (bien tinh)) - canh trinh va ((duong cong) or (dung cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: co ((lieu tinh) OR (bien tinh)) - canh trinh va ((duong cong) or (dung cong)) dan toan cao*.