Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hieu cach » hieu cac, chieu sach, biet cach
hieu ca » hieu cac, hieu cua, hieu va
tan van » tran van, tang van, luan 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: doc ((hieu cach) OR (hieu ca)) - hanh trung tuan ((nhung cong) OR (thong cong)) tan van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu cach) OR (hieu ca)) - hanh trung tuan ((nhung cong) or (thong cong)) tan van ban~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu cach) OR (hieu ca)) - hanh trung tuan ((nhung cong) or (thong cong)) tan van ban*.