Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cau theo » cau thi, cau tao
danh vai » danh sai, danh va, doanh van
hieu va » lieu va, hieu qua
vai cau » va cau, van cau, vai cac
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay

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