Perhaps you should try some spelling variations:
sach nganh » sach ngan, cac nganh, sach danh
sach tranh » canh tranh
thuyet hoa » thuyet va, huyet hoc
kxy thuat » ky thuat, ki thuat, my thuat
thuat san » thuat toan, thuat song, thuat lanh
san nganh » dang nganh, sang ngang, cac nganh
thuat do » thuat o
y thuyet » ly thuyet, li thuyet, ly huyet
do hoa » dong hoa

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