Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
thiet yeu » thiet ke, theo yeu
dung cong » dung trong
yeu tinh » yeu tin, lieu tinh, kieu tinh
dung cua » dung luan
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: thiet yeu tinh - hanh ((dung cua) or (dung cho)) ((nhung cong) or (dung cong)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thiet yeu tinh - hanh ((dung cua) OR (dung cho)) ((nhung cong) OR (dung cong)) dan toan tap.
• Adding a wildcard symbol may retrieve word variants: thiet yeu tinh - hanh ((dung cua) or (dung cho)) ((nhung cong) or (dung cong)) dan toan tap*.