Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
cua viet » hoa viet, cua vat, cua dieu
hanh vai » hanh vi, hanh va, hanh tai
dang xay » dang van, van xay
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ca viet » va viet, co viet, hoa viet
va cau » van cau, va cac, va dau

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 ky ((nang xa) or (dang xay)) hoi. lieu va cau thuc va hanh vai ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (dang xay)) hoi. lieu va cau thuc va hanh vai ((cua viet) OR (ca viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (dang xay)) hoi. lieu va cau thuc va hanh vai ((cua viet) OR (ca viet))*".