Perhaps you should try some spelling variations:
dung thuoc » dung hoc
biet lang » bien dang, viet nang, bien nang
nhung thi » nhung thoi, phung thi, nhung tri
thuoc moi » hoc moi, thuoc ma, thuoc tai
nhung gi » nhung bi, nhung bai
dung uoc » dung quoc, dung hoc, dung coc
thi he » thi hue, thi hoe, thi ha
he van » le van, ho van, ha van

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 biet lang. sach dung uoc mo ) or ( nhung thi he van. sach dung thuoc moi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( nhung gi biet lang. sach dung uoc mo ) OR ( nhung thi he van. sach dung thuoc moi )).
• Adding a wildcard symbol may retrieve word variants: (( nhung gi biet lang. sach dung uoc mo ) or ( nhung thi he van. sach dung thuoc moi ))*.