Perhaps you should try some spelling variations:
sach nganh » sach tranh, cac nganh, sach danh
sach ngan » sach ngon, sach nha, sach han
tranh cai » tranh cac, trinh cai, tranh chap
cai thuat » cac thuat, giai thuat, ki thuat
thu canh » thuc hanh, thu cong, thu ban
y thuat » ky thuat, my thuat, kxy thuat
do hoc » co hoc, do hoa, du hoc
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 nganh) OR (sach ngan)) y thuat o hoc ) or ( thu canh tranh cai thuat do hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu ((sach nganh) OR (sach ngan)) y thuat o hoc ) OR ( thu canh tranh cai thuat do hoc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu ((sach nganh) OR (sach ngan)) y thuat o hoc ) or ( thu canh tranh cai thuat do hoc ))*".