Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
dang xay » dang van, van xay
tam thuc » tham thuc, am thuc, nam thuc
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
hieu ve » hieu van
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
vai cau » va cau, van cau, vai cac

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 ty ((dang xay) or (nang ma)) hoi. ((hieu ve) or (hieu va)) tam thuc va hanh vai cau tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((dang xay) OR (nang ma)) hoi. ((hieu ve) OR (hieu va)) tam thuc va hanh vai cau tao.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((dang xay) or (nang ma)) hoi. ((hieu ve) or (hieu va)) tam thuc va hanh vai cau tao*.