Perhaps you should try some spelling variations:
doanh khoan » doanh khoa, doanh hoan, doanh nhan
nguoi doanh » nguoi dan, nguoi thanh, nguoi lanh
thuoc sinh » hoc sinh, thu sinh, thuoc sach
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
bai thuoc » ban thuoc, bai hoc, cay thuoc
sinh hoat » sinh hoc, sinh vat
ten nguoi » tren nguoi, den nguoi, dien nguoi
sach bai » sach dao, cac bai, sach xa
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 bai thuoc sinh hoat he thong ) or ( su sach ten nguoi doanh khoan phai thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach bai thuoc sinh hoat he thong ) OR ( su sach ten nguoi doanh khoan phai thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach bai thuoc sinh hoat he thong ) or ( su sach ten nguoi doanh khoan phai thong ))*.