Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
nang mai » nang ma, nang tai, nang cai
lang mai » lang dai, lang hai, lang man
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
cuu tre » cau tren, cau treo
xa hanh » xa thanh, xa khanh, va hanh
thuc xa » thuc xay, tuc xa, thuc va
cua tre » cua te, cua triet, dua tren
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 xa hanh tai ((cuu tre) OR (cua tre))~.
• 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 xa hanh tai ((cuu tre) OR (cua tre)).
• 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 xa hanh tai ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang mai) or (lang mai)) hoi. hieu va nam thuc xa hanh tai ((cuu tre) OR (cua tre))*.