Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van bach » van bac, van hach, van sach
thuoc va » thuoc ma, thuong va, thuoc tai
hanh lai » hanh lam, hanh tai, thanh lap
chau tre » chay tren, chau tho, cho tre
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
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 van bach ((thuoc va) or (thuc va)) hanh lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu van bach ((thuoc va) OR (thuc va)) hanh lai chau tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu van bach ((thuoc va) or (thuc va)) hanh lai chau tre*.