Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
cua viet » ca viet, hoa viet, cua vat
tu cach » tu cac
te sach » toc sach
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve nam » he nam, va nam, le nam
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (te sach)) ky nang x hoi. hieu ve nam thuc vat hanh vi ((cua viet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (te sach)) ky nang x hoi. hieu ve nam thuc vat hanh vi ((cua viet) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky nang x hoi. hieu ve nam thuc vat hanh vi ((cua viet) or (cuu tre))*.