Perhaps you should try some spelling variations:
quen vang » quan van, que van, que lang
dung thoi » dung thi, dung toi, dung thuoc
thoi luan » hoi luan, thi luan, thai luan
dung tri » dung tai, dung tren, dung sai
tri quen » tri quan, thoi quen, tri huyen
tac dung » sach dung, xay dung, tin dung
dung hoc » dung thuoc, trung hoc, dung khoa
hoc dong » hoc duong, hoc cong, hoc dung
dong hoc » dong co, dong luc
hoc noi » hoc nuoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( dung tri quen vang. tac dung hoc moi ) or ( dung thoi luan van. hoc dong hoc noi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( dung tri quen vang. tac dung hoc moi ) OR ( dung thoi luan van. hoc dong hoc noi )).
• Adding a wildcard symbol may retrieve word variants: (( dung tri quen vang. tac dung hoc moi ) or ( dung thoi luan van. hoc dong hoc noi ))*.