Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
dieu tinh » diep tinh, lieu tinh, dien tinh
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
hoc dieu » hoc thieu, hoc hien
dan toan » van toan, dan than, manh toan
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: hoc dieu tinh - canh tranh cua ((nhung cong) or (hang cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu tinh - canh tranh cua ((nhung cong) OR (hang cong)) dan toan cao*.