Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
nganh kkxy » nganh ky
thuat hoa » thuat toan, thuyet hoa, thuat do
thuat van » thuat san, thuat va, thuat vat
thuat ban » thuat bai, thuat bao, thuat san
thu sach » tu sach, thuat sach, thuoc sach
te sach » toc sach
y thuat » ky thuat, my thuat, kxy thuat

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 nganh y thuat hoa hoc ) or ( thu sach nganh kkxy ((thuat van) OR (thuat ban)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach nganh y thuat hoa hoc ) OR ( thu sach nganh kkxy ((thuat van) OR (thuat ban)) hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach nganh y thuat hoa hoc ) or ( thu sach nganh kkxy ((thuat van) OR (thuat ban)) hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach nganh y thuat hoa hoc ) or ( thu sach nganh kkxy ((thuat van) OR (thuat ban)) hoc ))*.