Perhaps you should try some spelling variations:
quan trong » gian trong
nhung thi » nhung thoi, nhung tri, nhung chi
biet quan » viet quan, bien quang, viet quang
trong ban » trong san, trong tan, trong quan
quan van » luan van, quan va, quan luan
ban than » ban thanh, van thanh, ban hang
phung » phuong, chung, phong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((phung thi) or (nhung thi)) quan van. biet quan trong ban than~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((phung thi) OR (nhung thi)) quan van. biet quan trong ban than.
• Adding a wildcard symbol may retrieve word variants: ((phung thi) or (nhung thi)) quan van. biet quan trong ban than*.