Perhaps you should try some spelling variations:
nguoi bach » nguoi sach, nguoi bac, nguoi benh
phan thong » phan thuong, phan hong, phan tong
cach thoi » cac thoi, cach thuc, cach noi
nang khoa » hang khoa, dang khoa, nang hoa
hoc thong » hoc thuong, hoc trong, hoc hong
tay nguoi » toc nguoi, dao nguoi
khoa hoc » hoa hoc
sach tay » xach tay, sach hay, sach nay
bach hoa » bach khoa, bach ha, cach hoan
hoa phan » hoa dan, co phan
tu cach » tu cac
thoi ki » thoi ky, thoi dai
ki nang » ky nang
te sach » toc 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 cach thoi ki nang khoa hoc thong ) or ( te sach tay nguoi bach hoa phan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach thoi ki nang khoa hoc thong ) OR ( te sach tay nguoi bach hoa phan thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cach thoi ki nang khoa hoc thong ) or ( te sach tay nguoi bach hoa phan thong ))*.