Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van nham » van nam, van nhan, van tham
thuc day » thuc dan
cao hoi » cau hoi, co hoi, cao hoc
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
vi cuu » vi luu, vinh cuu

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 cao hoi. hieu van nham ((thuc day) or (thuc vat)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang cao hoi. hieu van nham ((thuc day) OR (thuc vat)) hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang cao hoi. hieu van nham ((thuc day) or (thuc vat)) hanh vi cuu tre*.