Perhaps you should try some spelling variations:
nhanh hanh » nhanh thanh, nhanh thang, thanh thanh
nhung cong » thong cong, hang cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
toan tap » toan ban
toan cao » toan ban
ho hieu » ho chieu, hoi hieu, nho hieu
hanh va » hang va, hanh vi

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 - nhanh hanh va ((nhung cong) OR (dung cong)) van ((toan tap) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - nhanh hanh va ((nhung cong) OR (dung cong)) van ((toan tap) OR (toan cao))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - nhanh hanh va ((nhung cong) OR (dung cong)) van ((toan tap) or (toan cao))*".