Perhaps you should try some spelling variations:
thuoc sinh » hoc sinh, thu sinh, thuoc sach
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
ban thuoc » dang thuoc, cay thuoc, nam thuoc
sinh hoat » sinh hoc, sinh vat
ten nguoi » tren nguoi, den nguoi, dien nguoi
nguoi anh » nguoi lanh, nuoi anh, nguoi thanh
anh khoan » anh khoa, anh nhan, anh hoang
sach ban » sach bai, sach han, sach bac
sach ten » sach tien, sach tren, sach tet
tu sach » thu sach, te sach, tu cach
hoat he » hoa he, hoat ho, thuat he
su sach » so sach, vu 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 ban thuoc sinh hoat he thong ) or ( su sach ten nguoi anh khoan phai thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ban thuoc sinh hoat he thong ) OR ( su sach ten nguoi anh khoan phai thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach ban thuoc sinh hoat he thong ) or ( su sach ten nguoi anh khoan phai thong ))*.