Perhaps you should try some spelling variations:
nhung thoi » nhung thi, phung thi, nhung loi
quen vang » que van, que lang, quen hanh
quet lang » que lang, quan lang, biet lang
nhung gi » nhung bi, nhung bai
quan van » luan van, quan va, quan luan
vien cac » vien bach, vien dai, vien da
cac nuoc » cap nuoc, hoc nuoc, dat nuoc

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

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