Perhaps you should try some spelling variations:
tran thanh » ban thanh, van thanh, quan thanh
nhung thoi » nhung thi, phung thi, nhung loi
thoi quan » thoi quen, thi quan, thong quan
biet tran » viet tran, viet trang, biet trong
bien tran » bien tram, bien trong, hien trang
tan thanh » tang thanh, toan thanh, ban thanh
quan van » luan van, quan va, quan luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: nhung thoi quan van. ((biet tran) OR (bien tran)) hong ((tan thanh) or (tran thanh))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nhung thoi quan van. ((biet tran) OR (bien tran)) hong ((tan thanh) OR (tran thanh)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nhung thoi quan van. ((biet tran) OR (bien tran)) hong ((tan thanh) or (tran thanh))".
• Adding a wildcard symbol may retrieve word variants: nhung thoi quan van. ((biet tran) OR (bien tran)) hong ((tan thanh) or (tran thanh))*.