Perhaps you should try some spelling variations:
tcanh tranh » canh tranh, thanh thanh, can tranh
nhung dung » phuong dung, thong dung, trung dung
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » manh cua
doanh cua » doanh luan
tranh cau » trinh cau, tranh cac, tranh cai
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 - canh ((tranh cua) OR (doanh cua)) ((nhung dung) or (ung dung)) tcanh tranh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh ((tranh cua) OR (doanh cua)) ((nhung dung) OR (ung dung)) tcanh tranh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - canh ((tranh cua) OR (doanh cua)) ((nhung dung) or (ung dung)) tcanh tranh cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh ((tranh cua) OR (doanh cua)) ((nhung dung) or (ung dung)) tcanh tranh cau*.