Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
thuc day » thuc vat
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
hai cuu » hai cua, hai chu, hai cuc
cuu tre » cua tre, cau tren, cau treo
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: tu sach y nang xa hoi. hieu van cau ((truc va) or (((thuc day) or (thuc dan)))) thanh hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu van cau ((truc va) OR (((thuc day) OR (thuc dan)))) thanh hai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van cau ((truc va) or (((thuc day) or (thuc dan)))) thanh hai cuu tre*.