Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
toc sach » hoc sach, doc sach, thuoc sach
thi van » thi lan, thi hanh, thi nang
thuc va » thuc vat, thuc day
nang xa » nang x, lang xa, nang ma
dinh du » dinh duc, dinh cu, dinh tu
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
du cua » duy cua, dau cua, dum cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang xa hoi. ((thien van) or (thi van)) nham ((thuc va) OR (thuc dan)) dinh du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. ((thien van) OR (thi van)) nham ((thuc va) OR (thuc dan)) dinh du cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. ((thien van) or (thi van)) nham ((thuc va) OR (thuc dan)) dinh du cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. ((thien van) or (thi van)) nham ((thuc va) OR (thuc dan)) dinh du cua tre*.