Perhaps you should try some spelling variations:
danh viet » anh viet, ninh viet, nang viet
thuc dan » thuc hanh, hoc dan, thuc vat
viet cua » viec cua, viet ca, viet qua
doc sach » hoc sach, nuoc sach, dac sac
toc sach » hoc sach, thuoc sach, nuoc sach
va nham » va cham, va tham, va nha
thuc va » thuc vat, thuc day
nang xa » nang x, lang xa, nang ma
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) or (toc sach)) y nang xa hoi. lieu va nham ((thuc va) OR (thuc dan)) danh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc sach)) y nang xa hoi. lieu va nham ((thuc va) OR (thuc dan)) danh viet cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) or (toc sach)) y nang xa hoi. lieu va nham ((thuc va) OR (thuc dan)) danh viet cua tre".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (toc sach)) y nang xa hoi. lieu va nham ((thuc va) OR (thuc dan)) danh viet cua tre*.