Perhaps you should try some spelling variations:
danh viet » nang viet, dao viet
cham thuc » nham thuc, pham thuc, tham thuc
ninh viet » sinh vien
doc sach » hoc sach, toc sach, nuoc sach
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. lieu va cham thuc va ((((danh viet) or (anh viet))) or (ninh viet)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y nang xa hoi. lieu va cham thuc va ((((danh viet) OR (anh viet))) OR (ninh viet)) cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sach y nang xa hoi. lieu va cham thuc va ((((danh viet) or (anh viet))) or (ninh viet)) cua tre*.