Perhaps you should try some spelling variations:
sach tranh » canh tranh
phan thong » phan thuong, phan hong, phan tong
tranh thuc » trinh thuc, trang thuc, thanh thuy
khoa phan » hoa phan, khoa than, khoa phau
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
xac thai » rac thai, sac thai, xa thai
thai hoc » dai hoc, bai hoc, hoi hoc
anh khoa » doanh khoa, hang khoa
hoc anh » hoc nganh, hoc nhanh, ngoc anh
tu sach » thu sach, su sach, te sach
khoa he » hoa he, khoa hoc, khong he
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su xac thai hoc anh khoa phan thong ) or ( tu sach tranh thuc cach khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su xac thai hoc anh khoa phan thong ) OR ( tu sach tranh thuc cach khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( su xac thai hoc anh khoa phan thong ) or ( tu sach tranh thuc cach khoa he thong ))*.