Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
nhung cong » dung cong, thong cong, hang cong
tuong cua » truong cua, huong cua, thong cua
cua nhung » va nhung
bien cac » vien cac, dien cac, bien ca
bieu cua » dieu cua, hieu cua, ben cua
ban toan » bai toan, van toan, bao toan
ban than » ban thanh, van thanh, ban hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((bien cac) or (bieu cua)) - thanh tuong cua nhung cong ((ban toan) OR (ban than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((bien cac) OR (bieu cua)) - thanh tuong cua nhung cong ((ban toan) OR (ban than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((bien cac) or (bieu cua)) - thanh tuong cua nhung cong ((ban toan) OR (ban than)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((bien cac) or (bieu cua)) - thanh tuong cua nhung cong ((ban toan) OR (ban than)) cao*.