Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
cong thanh » dong thanh, cong trinh, cong tan
tranh cua » doanh cua, manh cua
cua nhung » va nhung
pho bien » phan bien, che bien, so bien
cong tac » cong ty
toan tap » toan ban
ho bien » hoa bien, so bien, bo bien

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

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