Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh
bien tinh » bi tinh, yen tinh, diep tinh
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
trinh va » trinh van, trinh ve, trinh vi
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: ho ((lieu tinh) or (bien tinh)) - canh ((trinh va) OR (trinh vat)) dung cong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((lieu tinh) OR (bien tinh)) - canh ((trinh va) OR (trinh vat)) dung cong manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((lieu tinh) or (bien tinh)) - canh ((trinh va) OR (trinh vat)) dung cong manh toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((lieu tinh) or (bien tinh)) - canh ((trinh va) OR (trinh vat)) dung cong manh toan cao*.