Perhaps you should try some spelling variations:
sach loai » sach bai, cac loai, sach doi
loai nang » loai nam, luan nang, loai san
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
va hanh » va thanh, va danh, ban hanh
ma hoi » mai hoi, xa hoi, ma hoa

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 loai nang ma hoi. hieu van nam thuc ((va hanh) OR (van hanh)) dai cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach loai nang ma hoi. hieu van nam thuc ((va hanh) OR (van hanh)) dai cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach loai nang ma hoi. hieu van nam thuc ((va hanh) OR (van hanh)) dai cua vat*.