Perhaps you should try some spelling variations:
hanh vit » hanh vi, danh viet, hanh tiet
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
ca viet » va viet, co viet, hoa viet
hieu ve » hieu van
sang ma » tang ma, nang ma, sang tao
ma hoi » mai hoi, xa hoi, ma hoa
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 ky) or (sach y)) sang ma hoi. ((hieu ve) OR (hieu va)) nam thuc va hanh vit ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) sang ma hoi. ((hieu ve) OR (hieu va)) nam thuc va hanh vit ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) sang ma hoi. ((hieu ve) OR (hieu va)) nam thuc va hanh vit ca viet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) sang ma hoi. ((hieu ve) OR (hieu va)) nam thuc va hanh vit ca viet*.