Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, co sach
vai cua » dai cua, hai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
vu sach » vu bach, su sach, vu khach
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » truc va, tuc xa, duc va
va cam » va cham, va cac, va cao

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