Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
thuyet hoa » thuyet va, huyet hoc
nhanh thi » nhanh thai, nhanh thuc, nhan tai
nganh ky » nganh y, nganh xay, hanh ky
thuat do » thuat o
nhanh li » nhanh vi, thanh loi, nhanh hai
tu sach » thu sach, su sach, te sach
so sanh » do sanh
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: (( tu sach nganh ky thuat do hoa ) or ( so sanh ((nhanh li) OR (nhanh thi)) thuyet hoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach nganh ky thuat do hoa ) OR ( so sanh ((nhanh li) OR (nhanh thi)) thuyet hoa hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach nganh ky thuat do hoa ) or ( so sanh ((nhanh li) OR (nhanh thi)) thuyet hoa hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach nganh ky thuat do hoa ) or ( so sanh ((nhanh li) OR (nhanh thi)) thuyet hoa hoc ))*.