Perhaps you should try some spelling variations:
sach minh » sach kinh, sach danh, sac tinh
sach hanh » sach danh, sach han, sac hanh
thu sach » thuat sach, thuoc sach, thu hoach
ky huyet » ly huyet, ly thuyet, cay huyet
hanh ky » hanh kem
thuat o » thuat do
tu sach » su sach, te sach, tu cach
minh ky » kinh ky, minh ly, trinh ky
hoc hoc » toc hoc, hoc hoi, duoc hoc
hoc hoa » hoc khoa
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 hanh ky thuat o hoc ) or ( tu sach minh ky huyet ((hoc hoc) OR (hoc hoa)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach hanh ky thuat o hoc ) OR ( tu sach minh ky huyet ((hoc hoc) OR (hoc hoa)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu sach hanh ky thuat o hoc ) or ( tu sach minh ky huyet ((hoc hoc) OR (hoc hoa)) ))".
• Adding a wildcard symbol may retrieve word variants: (( thu sach hanh ky thuat o hoc ) or ( tu sach minh ky huyet ((hoc hoc) OR (hoc hoa)) ))*.