Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
thuat hoa » thuat toan, thuyet hoa, thuat do
nganh kxy » nganh ky, nganh y, nganh xay
kxy thuat » ky thuat, my thuat, ky thua
tranh ki » trinh ki, thanh kim, tranh cai
ki thuat » ky thuat
thu sach » tu sach, thuat sach, thuoc sach
thuat va » thuyet va, thuat xay, thuat bai
te canh » ve canh, te danh, re canh
va hoc » van hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te canh tranh ki thuat hoa hoc ) or ( thu sach nganh kxy thuat va hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te canh tranh ki thuat hoa hoc ) OR ( thu sach nganh kxy thuat va hoc )).
• Adding a wildcard symbol may retrieve word variants: (( te canh tranh ki thuat hoa hoc ) or ( thu sach nganh kxy thuat va hoc ))*.