Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
dau tren » dau tien, dat tren, dau tieng
toc sac » toc sach, toc san, hoc sach
dan vai » dan va, dan tai, dan vat
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va nam » van nam, ha nam, va nay
sac ky » cac ky, sai ky
cua te » cua tu
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky lang xa hoi. hieu va nam thuc va dan vai ((dau tren) or (((cua te) or (cuu tre))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky lang xa hoi. hieu va nam thuc va dan vai ((dau tren) OR (((cua te) OR (cuu tre)))).
• Adding a wildcard symbol may retrieve word variants: toc sac ky lang xa hoi. hieu va nam thuc va dan vai ((dau tren) or (((cua te) or (cuu tre))))*.