Perhaps you should try some spelling variations:
thuoc va » thuoc ma, thuong va, thuoc tai
hanh hai » thanh hai, nhanh hai, hang hai
hai cua » thai cua, dai cua, hoi cua
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
ve bach » vu bach, vi bach, vien bach
ve cach » va cach, ve cac, ve canh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: tu sach y nang x hoi. hieu ((ve bach) OR (ve cach)) ((thuoc va) or (thuc va)) hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ((ve bach) OR (ve cach)) ((thuoc va) OR (thuc va)) hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu ((ve bach) OR (ve cach)) ((thuoc va) or (thuc va)) hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((ve bach) OR (ve cach)) ((thuoc va) or (thuc va)) hanh hai cua tre*.