Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cau thuc » cau truc, cuu thuc, can thuc
so sach » so sanh, bo sach, co sach
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
ty hang » ly hang, ty xang, thi hang
ly nang » ky nang, ly hang, ly vang
ty nang » ky nang, ty xang, ty nong
va cau » van cau, va cac, va dau
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((((ty nang) OR (ly nang))) or (ty hang)) x hoi. lieu va cau thuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((((ty nang) OR (ly nang))) OR (ty hang)) x hoi. lieu va cau thuc van hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((((ty nang) OR (ly nang))) or (ty hang)) x hoi. lieu va cau thuc van hanh di cua tre*".