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
te sach » toc sach
tai cuu » tai cuc, tai cua, thai cua
xa hanh » xa thanh, xa khanh, va hanh
thuc xa » thuc xay, tuc xa, thuc va
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
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) OR (tai buu)) 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) OR (tai buu)) 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) OR (tai buu)) 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) OR (tai buu)) tre*.