Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
sach han » sach tham, sach danh, sach nang
thuat o » thuat do
tu sach » su sach, te sach, tu cach
kinh ky » trinh ky, kinh tay
minh ky » minh ly, trinh ky, minh huy
hoc hoc » hoc hoa, toc hoc, hoc hoi
han ky » hanh ky, than ky, nhan ky
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach han ky thuat o hoc ) or ( tu sach ((kinh ky) OR (minh ky)) huyet hoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach han ky thuat o hoc ) OR ( tu sach ((kinh ky) OR (minh ky)) huyet hoc hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu sach han ky thuat o hoc ) or ( tu sach ((kinh ky) OR (minh ky)) huyet hoc hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thu sach han ky thuat o hoc ) or ( tu sach ((kinh ky) OR (minh ky)) huyet hoc hoc ))*.