Perhaps you should try some spelling variations:
sinh thuoc » sinh thuc, sinh hoc, sinh duoc
sach sinh » sach kinh, sach danh, sach song
thuoc anh » thuoc thanh, thuoc dang, thuoc sach
tri thuoc » tri thuc, tri hoc, tin thuoc
thuoc tan » thuoc tai, thuoc ban, thuoc tren
pho thong » he thong
anh nghe » lang nghe, nang nghe, van nghe
te thong » te thuong, he thong, te trong
sach tri » sach tai, sach tren, sach truc
tan khoa » toan khoa, tran khoa, san khoa
khoa pho » khoa phu, khoa khoa, khoa phau
su sach » vu sach
nghe te » nghe tu, nghe theu, nghiem te
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach sinh thuoc anh nghe te thong ) or ( so sach tri thuoc tan khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach sinh thuoc anh nghe te thong ) OR ( so sach tri thuoc tan khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach sinh thuoc anh nghe te thong ) or ( so sach tri thuoc tan khoa pho thong ))*.