Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
toc sac » toc sach, toc san, hoc sach
vai cuu » vai cua
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
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
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) or (ky dang)) xa hoi. ((hieu va) OR (hieu qua)) nam thuc va dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ((ky lang) OR (ky dang)) xa hoi. ((hieu va) OR (hieu qua)) nam thuc va dan vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ((ky lang) or (ky dang)) xa hoi. ((hieu va) OR (hieu qua)) nam thuc va dan vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sac ((ky lang) or (ky dang)) xa hoi. ((hieu va) OR (hieu qua)) nam thuc va dan vai cuu tre*.