Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
van lam » van nam
van cam » van nam, van cau, van dam
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua
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: te sach y nang ((x hoi) OR (o hoi)). hieu ((van cam) or (van lam)) luc va thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((x hoi) OR (o hoi)). hieu ((van cam) OR (van lam)) luc va thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((x hoi) OR (o hoi)). hieu ((van cam) or (van lam)) luc va thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((x hoi) OR (o hoi)). hieu ((van cam) or (van lam)) luc va thanh di cua tre*.