Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dong
cac thuc » cach thuc, cac thu, can thuc
su sach » so sach, vu sach
so sanh » do sanh
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, voi nang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di 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 (so sanh)) ((v nang) OR (van nang)) ma hoi. lieu va cac thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ((v nang) OR (van nang)) ma hoi. lieu va cac thuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ((v nang) OR (van nang)) ma hoi. lieu va cac thuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ((v nang) OR (van nang)) ma hoi. lieu va cac thuc va hanh vi cua tre*.