Perhaps you should try some spelling variations:
tranh nguoi » thanh nguoi, tinh nguoi, ran nguoi
dang thuoc » dung thuoc
thuoc dang » thuoc dung, thuoc khang, thuc dan
sach tranh » canh tranh
nguoi sach » nguoi san, nuoc sach
sanh dang » anh dang, sanh dan, anh dong
dang khoa » dung khoa, hang khoa, dang khoi
hoc thong » hoc thuong, hoc trong, hoc hong
pho thong » he thong
khoa hoc » hoa hoc
hoc sach » hoc sinh, hoc cac, hoc anh
so sanh » do sanh
nha pho » nha tho, nha khoa, nghe pho

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sanh dang thuoc dang khoa hoc thong ) or ( hoc sach tranh nguoi sach nha pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh dang thuoc dang khoa hoc thong ) OR ( hoc sach tranh nguoi sach nha pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh dang thuoc dang khoa hoc thong ) or ( hoc sach tranh nguoi sach nha pho thong ))*.