Perhaps you should try some spelling variations:
tranh trong » tran trong, trinh trong, anh trong
viet tranh » viet thanh, viet trinh, viet trang
nhung thoi » phung thi, nhung loi, nhung tri
nhung thi » phung thi, nhung tri, nhung chi
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 (nhung thoi)) quan van. viet tranh trong cac tuan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nhung thi) OR (nhung thoi)) quan van. viet tranh trong cac tuan.
• Adding a wildcard symbol may retrieve word variants: ((nhung thi) or (nhung thoi)) quan van. viet tranh trong cac tuan*.