Perhaps you should try some spelling variations:
tran trong » gian trong, quan trong, tran hong
nhung thi » nhung thoi, nhung tri, nhung chi
quen vang » que van, que lang, quen hanh
biet tran » bien tran, viet tran, viet trang
quan van » luan van, quan va, quan luan
cac tuan » cac thanh, cac thuat, cac tuong

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

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