Perhaps you should try some spelling variations:
danh viet » anh viet, nang viet, dao viet
nham thuc » nhan thuc, nam thuc, nham thu
ninh viet » sinh vien, anh viet
doc sach » hoc sach, toc sach, nuoc sach
nang xa » nang x, lang xa, nang ma
va nham » va cham, va tham, va nha
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 nham thuc va ((danh viet) OR (ninh viet)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach y nang xa hoi. lieu va nham thuc va ((danh viet) OR (ninh viet)) cua tre".
• Adding a wildcard symbol may retrieve word variants: doc sach y nang xa hoi. lieu va nham thuc va ((danh viet) OR (ninh viet)) cua tre*.