Perhaps you should try some spelling variations:
thuoc va » thuoc ma, thuong va, thuoc tai
hanh lai » hanh lam, hanh tai, thanh lap
lai cuu » lai cua, lai chau, lai cuoc
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
ve canh » van canh, ve thanh
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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) OR (o hoi)). hieu ve canh ((thuoc va) or (thuc va)) hanh lai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (o hoi)). hieu ve canh ((thuoc va) OR (thuc va)) hanh lai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) OR (o hoi)). hieu ve canh ((thuoc va) or (thuc va)) hanh lai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) OR (o hoi)). hieu ve canh ((thuoc va) or (thuc va)) hanh lai cuu tre*.