Perhaps you should try some spelling variations:
sach hanh » sach danh, sach han, sac hanh
thuat hoa » thuat toan, thuyet hoa, thuat do
kem thuat » kiem thuat, ki thuat, ve thuat
bac hanh » bac thanh, ban hanh, sac hanh
bao hanh » ban hanh, dao hanh, ban thanh
tu sach » thu sach, su sach, te sach
hanh ky » hanh kem

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 hanh ky thuat hoa hoc ) or ( tu ((bac hanh) OR (bao hanh)) kem thuat hoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach hanh ky thuat hoa hoc ) OR ( tu ((bac hanh) OR (bao hanh)) kem thuat hoa hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach hanh ky thuat hoa hoc ) or ( tu ((bac hanh) OR (bao hanh)) kem thuat hoa hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach hanh ky thuat hoa hoc ) or ( tu ((bac hanh) OR (bao hanh)) kem thuat hoa hoc ))*.