Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, phong chong
hieu lang » chieu sang, hieu quang, nhieu tang
trung va » truong va, trang va, trung ha
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh trung va ((nhung cong) or (((thong cong) OR (thong thong)))) tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh trung va ((nhung cong) OR (((thong cong) OR (thong thong)))) tac toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh trung va ((nhung cong) or (((thong cong) OR (thong thong)))) tac toan tap".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh trung va ((nhung cong) or (((thong cong) OR (thong thong)))) tac toan tap*.