Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
danh viet » anh viet, nang viet, dao viet
ninh viet » sinh vien, anh viet
doc sach » hoc sach, toc sach, nuoc sach
sach ky » sac ky, sach y, sach ty
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
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: doc sach ky nang x hoi. lieu va cham thuc vat ((danh viet) OR (ninh viet)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang x hoi. lieu va cham thuc vat ((danh viet) OR (ninh viet)) cua tre".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang x hoi. lieu va cham thuc vat ((danh viet) OR (ninh viet)) cua tre*.