Perhaps you should try some spelling variations:
nhung thoi » phung thi, nhung loi, nhung tri
nhung thi » phung thi, nhung tri, nhung chi
biet tran » bien tran, viet trang, biet trong
viet tran » viet trang, viet tuan, viet trung
cac tuan » cac thanh, cac thuat, cac tuong
luan va » luan van, luat va
quan vi » quan li, quan tri, quan doi

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 (nhung thoi)) ((luan va) or (quan vi)). ((biet tran) OR (viet tran)) trong cac tuan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nhung thi) OR (nhung thoi)) ((luan va) OR (quan vi)). ((biet tran) OR (viet tran)) trong cac tuan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nhung thi) or (nhung thoi)) ((luan va) or (quan vi)). ((biet tran) OR (viet tran)) trong cac tuan".
• Adding a wildcard symbol may retrieve word variants: ((nhung thi) or (nhung thoi)) ((luan va) or (quan vi)). ((biet tran) OR (viet tran)) trong cac tuan*.