Perhaps you should try some spelling variations:
danh viet » anh viet, ninh viet, nang viet
doc sach » hoc sach, toc sach, nuoc sach
thuc dan » thuc hanh, thuc vat
viet cua » viec cua, viet ca, viet qua
nang xa » nang x, lang xa, nang ma
va nhan » van nhan, ca nhan, va phan
thuc va » thuc vat, 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 nhan ((thuc va) or (((thuc dan) OR (hoc dan)))) danh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y nang xa hoi. lieu va nhan ((thuc va) OR (((thuc dan) OR (hoc dan)))) danh viet cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach y nang xa hoi. lieu va nhan ((thuc va) or (((thuc dan) OR (hoc dan)))) danh viet cua tre*".