Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cua triet, dua tren
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
te sach » toc sach
van cac » van hac, van cau, van bac
mai hoi » mai khoi, dai hoi, lai hoi
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu hoach)) ky nang mai hoi. hieu van cac thuc va danh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu hoach)) ky nang mai hoi. hieu van cac thuc va danh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu hoach)) ky nang mai hoi. hieu van cac thuc va danh vi ((cua tre) or (cuu tre))*.