Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hanh vit » hanh vi, danh viet, hanh tiet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, hoa viet
me hoi » le hoi
ve nam » he nam, va nam, le nam
vit ca » viet ca, viet cau

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 ty tang ((me hoi) or (xa hoi)). hieu ve nam thuc va hanh vit ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty tang ((me hoi) OR (xa hoi)). hieu ve nam thuc va hanh vit ca viet.
• Adding a wildcard symbol may retrieve word variants: su sach ty tang ((me hoi) or (xa hoi)). hieu ve nam thuc va hanh vit ca viet*.