Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
dang xay » dang van
su sach » so sach, vu sach
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
va nham » va cham, va tham, va nha
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, mang cua
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((mang xa) or (((dang xay) OR (van xay)))) hoi. lieu va nham thuc va hanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((mang xa) OR (((dang xay) OR (van xay)))) hoi. lieu va nham thuc va hanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((mang xa) or (((dang xay) OR (van xay)))) hoi. lieu va nham thuc va hanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((mang xa) or (((dang xay) OR (van xay)))) hoi. lieu va nham thuc va hanh ve cua tre*.