Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
thuat van » thuat va, thuat ban, thuat vat
thuat san » thuat toan, thuat song, thuat lanh
thuat hoa » thuat toan, thuyet hoa, thuat do
nganh ky » nganh y, nganh xay, hanh ky
vu sach » vu bach, su sach, vu khach
bo sach » co sach, hoc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vu sach nganh mac ((thuat van) OR (thuat san)) hoc ) or ( bo sach nganh ky thuat hoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach nganh mac ((thuat van) OR (thuat san)) hoc ) OR ( bo sach nganh ky thuat hoa hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( vu sach nganh mac ((thuat van) OR (thuat san)) hoc ) or ( bo sach nganh ky thuat hoa hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( vu sach nganh mac ((thuat van) OR (thuat san)) hoc ) or ( bo sach nganh ky thuat hoa hoc ))*.