Perhaps you should try some spelling variations:
sach tranh » canh tranh
thuat hoa » thuat toan, thuyet hoa, thuat do
cac nganh » hoc nganh
nganh kxy » nganh ky, nganh y, nganh xay
tranh ki » trinh ki, thanh kim, tranh cai
ki thuat » ky thuat
thuat va » thuat xay, thuat bai, thuat bao
te sach » toc sach
thu cac » tu cac, thu xac, thu cuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tranh ki thuat hoa hoc ) or ( thu cac nganh kxy ((thuat va) OR (thuyet va)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tranh ki thuat hoa hoc ) OR ( thu cac nganh kxy ((thuat va) OR (thuyet va)) hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach tranh ki thuat hoa hoc ) or ( thu cac nganh kxy ((thuat va) OR (thuyet va)) hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach tranh ki thuat hoa hoc ) or ( thu cac nganh kxy ((thuat va) OR (thuyet va)) hoc ))*.