Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sang tao » hang tai
danh vai » danh sai, danh va, doanh van
nam thuc » nam thuoc, am thuc, nam thu
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
sang ma » tang ma, nang ma, mang may
vai cau » va cau, van cau, vai cac
tu sach » thu sach, su sach, te sach
va nam » van nam, ha nam, va nay

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 y ((((sang ma) OR (sang tao))) or (nang x)) hoi. hieu va nam thuc va danh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((((sang ma) OR (sang tao))) OR (nang x)) hoi. hieu va nam thuc va danh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((((sang ma) OR (sang tao))) or (nang x)) hoi. hieu va nam thuc va danh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((((sang ma) OR (sang tao))) or (nang x)) hoi. hieu va nam thuc va danh vai cau tren*.