Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
nam thuc » nam thuoc, am thuc, nam thu
nang mai » nang ma, nang tai, nang cai
cau treo » cau tren, cau triet, cau trieu
lang mai » lang dai, lang hai, lang man
hanh tai » thanh tai, hang tai, han tai
xay hanh » day nhanh, day thanh, xanh hanh
thuc xay » thuc day, tuc xay, thuat xay
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
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: te sach ky ((nang mai) or (lang mai)) hoi. hieu va nam thuc xay hanh tai ((cau treo) OR (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang mai) OR (lang mai)) hoi. hieu va nam thuc xay hanh tai ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang mai) or (lang mai)) hoi. hieu va nam thuc xay hanh tai ((cau treo) OR (cau theo))".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang mai) or (lang mai)) hoi. hieu va nam thuc xay hanh tai ((cau treo) OR (cau theo))*.