Perhaps you should try some spelling variations:
nhung bong » nhung cong, nhung bang, nhung chong
hieu cach » chieu sach, hieu ca, biet cach
doanh cua » doanh luan
hieu cac » hieu luc, hieu va, hieu van
manh cua » ban cua
bong van » song van, tong van, hong van
van toan » van tuan, van tan, van thanh
toan ban » van ban

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

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