Perhaps you should try some spelling variations:
nhung thoi » nhung thi, nhung loi, nhung tri
thoi quan » thoi quen, thi quan, thong quan
boi duong » hai duong, doi tuong, con duong
duong loi » duong co, duong thi
quan van » quan va, quan luan, quan doan
thi luan » thi lan, thi xuan, thi loan
tac dung » sach dung, xay dung, tin dung
dung hoc » dong hoc, dung thuoc, trung hoc
loi co » loai co, moi co, hoi co
hoc mo » hoc moi, hoc mot, hoc mon

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( nhung thoi quan van. boi duong loi co ) or ( phung thi luan van. tac dung hoc mo ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( nhung thoi quan van. boi duong loi co ) OR ( phung thi luan van. tac dung hoc mo )).
• Adding a wildcard symbol may retrieve word variants: (( nhung thoi quan van. boi duong loi co ) or ( phung thi luan van. tac dung hoc mo ))*.