Perhaps you should try some spelling variations:
van nhuong » van chuong, van phuong, van huong
thanh tran » thanh trang, thanh toan, thanh tra
hieu cach » chieu sach, hieu ca, biet cach
van nhung » va nhung, van hung, van phung
huong van » huong dan, duong van, hong van
van thanh » ban thanh, van tuan
thanh tap » thanh lap, thanh tai, thanh tay
hieu cac » hieu luc, hieu va, hieu van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (hieu cac)) - thanh tran ((van nhung) OR (van nhuong)) huong van thanh tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu cach) OR (hieu cac)) - thanh tran ((van nhung) or (van nhuong)) huong van thanh tap~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) OR (hieu cac)) - thanh tran ((van nhung) or (van nhuong)) huong van thanh tap*.