Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
tuc va » truc va, tuc xa, duc va
vi cua » vai cua, di 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: ((su sach) or (te sach)) ky nang x hoi. hieu ve cac ((tuc va) OR (thuc va)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang x hoi. hieu ve cac ((tuc va) OR (thuc va)) thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky nang x hoi. hieu ve cac ((tuc va) OR (thuc va)) thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang x hoi. hieu ve cac ((tuc va) OR (thuc va)) thanh vi cua tre*.