Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
lieu tinh » trieu tinh, diep tinh, bien tinh
trung cua » truong cua, trung tuan, trung cap
truong ca » truong cao, truong va, trong ca
ban toan » ban than, van toan, bao toan
bai toan » bai tap
ho lieu » so lieu, co lieu, ho kieu

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 - thanh ((trung cua) or (truong ca)) nhung cong ((ban toan) OR (bai toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho lieu tinh - thanh ((trung cua) OR (truong ca)) nhung cong ((ban toan) OR (bai toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho lieu tinh - thanh ((trung cua) or (truong ca)) nhung cong ((ban toan) OR (bai toan)) ban".
• Adding a wildcard symbol may retrieve word variants: ho lieu tinh - thanh ((trung cua) or (truong ca)) nhung cong ((ban toan) OR (bai toan)) ban*.