Perhaps you should try some spelling variations:
tien thuoc » trien thuoc, tin thuoc, bien thuoc
thuoc sinh » hoc sinh, thu sinh
thuoc sach » hoc sach, nuoc sach, thuat sach
sach tien » sach tren, sach thieu
sinh hoai » sinh hoat, sinh hoc, sinh thai
thu thong » thuy thong, thu thang, thu tuong
nha thuoc » nha nuoc, nhan thuc, nha hoc
sach khoa » bach khoa, anh khoa, sinh khoa
hoc thong » hoc thuong, hoc trong, hoc hong
hoai thu » doi thu
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach

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

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