Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
dinh cuu » dinh chi
dieu cuu » dieu cua, dien cuc, dieu can
lang hoa » hang hoa, lang ha, nang hoa
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu le » hieu ve, hieu he, hieu ly
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
so sanh » do sanh
le nam » ly nam, he nam, le na

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) or (so sanh)) ky lang hoa hoi. hieu le nam thuc va hanh ((dieu cuu) OR (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sanh)) ky lang hoa hoi. hieu le nam thuc va hanh ((dieu cuu) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sanh)) ky lang hoa hoi. hieu le nam thuc va hanh ((dieu cuu) OR (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sanh)) ky lang hoa hoi. hieu le nam thuc va hanh ((dieu cuu) OR (dinh cuu)) tre*.