Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
hanh ca » hanh cac, hanh cat, hanh cua
thuc va » thuc vat, thuc dan, thuc day
van cam » van nam, van lam, van cau
nang co » nang cao, nang doc, nang noi
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
xuc va » duc va, tuc va, luc va
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (te sach)) ky nang co hoi. hieu van cam ((xuc va) or (thuc va)) hanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang co hoi. hieu van cam ((xuc va) OR (thuc va)) hanh ca cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang co hoi. hieu van cam ((xuc va) or (thuc va)) hanh ca cua tre*.