Perhaps you should try some spelling variations:
quen vang » quan van, que van, quen hanh
doi tuong » moi truong, doi song
tuong hoc » truong hoc, tuong ho, duong hoc
nhung tri » nhung bai, dung tri, nhung gi
nhung bi » nhung bai, nhung gi
que lang » quet lang, quan lang, que quang
noi dung » hoc dung
dung hoc » dong hoc, dung thuoc, trung hoc
bi quen » bi quyet, bi quang, si quyen
tri que » tri tue, tri quan, tren que
hoc mo » hoc moi, hoc mot, hoc mon
hoc o » hoc co, hoc bo, hoc do

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( nhung bi quen vang. doi tuong hoc o ) or ( nhung tri que lang. noi dung hoc mo ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( nhung bi quen vang. doi tuong hoc o ) OR ( nhung tri que lang. noi dung hoc mo )).
• Adding a wildcard symbol may retrieve word variants: (( nhung bi quen vang. doi tuong hoc o ) or ( nhung tri que lang. noi dung hoc mo ))*.