Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
toc sac » toc sach, toc san, hoc sach
vai cuu » vai cua
dan vai » dan va, dan tai, dan vat
hieu va » lieu va, hieu qua
van hoi » van hoa, van hoe, van loi
van hoc » van hoa
ky lang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
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 ((van hoi) or (van hoc)). hieu va ((nam thuc) or (am thuc)) va dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky lang ((van hoi) OR (van hoc)). hieu va ((nam thuc) OR (am thuc)) va dan vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sac ky lang ((van hoi) or (van hoc)). hieu va ((nam thuc) or (am thuc)) va dan vai cuu tre*.