Perhaps you should try some spelling variations:
nguoi ninh » nguoi binh, nguoi kinh, nguoi sinh
phau thong » phap thong, khau thong, phan thong
khoa phau » hoa phan, khoa kham, khoa than
tay nguoi » toc nguoi, dao nguoi
ninh khoa » sinh khoa, ninh hoa, dinh khoa
dan khoa » dang khoa, da khoa, san khoa
sach tay » xach tay, sach hay, sach nay
tu sach » thu sach, su sach, te sach
nha hoc » nha thuoc, khoa hoc, nha nuoc
so sach » so sanh, bo sach, co sach
khoa he » hoa he, khoa hoc, khong he

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 nha hoc dan khoa phau thong ) or ( so sach tay nguoi ninh khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach nha hoc dan khoa phau thong ) OR ( so sach tay nguoi ninh khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach nha hoc dan khoa phau thong ) or ( so sach tay nguoi ninh khoa he thong ))*.