Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hanh tai » thanh tai, hang tai, han tai
cao tren » ca tren, cau tren, co tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, mang may
sang ma » tang ma, sang tao, mang may
lieu ha » lieu nha, lieu va, liem ha
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tai cao » thai cao, tao cao, tai sao

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 ky ((((nang ma) OR (nang cao))) or (sang ma)) hoa. lieu ha nam thuc va hanh tai cao tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((((nang ma) OR (nang cao))) OR (sang ma)) hoa. lieu ha nam thuc va hanh tai cao tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((((nang ma) OR (nang cao))) or (sang ma)) hoa. lieu ha nam thuc va hanh tai cao tren*".