Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
dan vat » dang vat, van vat, dan va
dan vai » dan va, dan tai, den vai
thuc va » thuc vat, thuc dan, thuc day
toc sac » toc sach, toc san, hoc sach
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cuu tre » cua tre, cau tren, cau treo
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: toc sac ((ky lang) or (ky dang)) xa hoi. hieu va nam thuc va ((dan vai) OR (dan vat)) 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 nam thuc va ((dan vai) OR (dan vat)) 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 nam thuc va ((dan vai) OR (dan vat)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sac ((ky lang) or (ky dang)) xa hoi. hieu va nam thuc va ((dan vai) OR (dan vat)) cuu tre*.