Perhaps you should try some spelling variations:
thuc day » thuc vat
thuc dan » thuc hanh, hoc dan, thuc vat
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
tai cuu » tai cuc, tai buu, tai cua
thuc va » thuc vat
ky lang » ky nang, ky dang, ky tang
dan tai » van tai, dan thi, han tai
san ky » sang ky, van ky, dan ky
va nay » va ngay, va cay

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc san ky lang xa hoi. hieu va nay ((((thuc va) OR (thuc dan))) or (thuc day)) dan tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc san ky lang xa hoi. hieu va nay ((((thuc va) OR (thuc dan))) OR (thuc day)) dan tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc san ky lang xa hoi. hieu va nay ((((thuc va) OR (thuc dan))) or (thuc day)) dan tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc san ky lang xa hoi. hieu va nay ((((thuc va) OR (thuc dan))) or (thuc day)) dan tai cuu tre*.