Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam thuc » lam thuoc, am thuc, nam thuc
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
van lam » van nam
tu sach » thu sach, su sach, tu cach
ky dang » ky danh
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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) OR (te sach)) ((ky dang) or (ky nang)) xa hoi. hieu van lam thuc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ((ky dang) OR (ky nang)) xa hoi. hieu van lam thuc va hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ((ky dang) or (ky nang)) xa hoi. hieu van lam thuc va hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ((ky dang) or (ky nang)) xa hoi. hieu van lam thuc va hanh di cua tre*.