Perhaps you should try some spelling variations:
lieu tinh » diep tinh, bien tinh
nang cong » nang song, dang cong, bang cong
tung dao » tuong dao, hung dao, tung do
tung dan » dung dan, huong dan, trung dai
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((lieu tinh) or (trieu tinh)) - thanh ((tung dao) OR (tung dan)) nang cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((lieu tinh) OR (trieu tinh)) - thanh ((tung dao) OR (tung dan)) nang cong san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((lieu tinh) or (trieu tinh)) - thanh ((tung dao) OR (tung dan)) nang cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: doi ((lieu tinh) or (trieu tinh)) - thanh ((tung dao) OR (tung dan)) nang cong san toan ban*.