Perhaps you should try some spelling variations:
quan thanh » ban thanh, van thanh
thanh di » thanh doi, thanh de, thanh do
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cam » va cham, va cao, va cai
di cua » dai cua, doi cua, de cua

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 cao hoi. hieu ((((va cam) OR (va cac))) or (va chat)) qua quan thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang cao hoi. hieu ((((va cam) OR (va cac))) OR (va chat)) qua quan thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang cao hoi. hieu ((((va cam) OR (va cac))) or (va chat)) qua quan thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang cao hoi. hieu ((((va cam) OR (va cac))) or (va chat)) qua quan thanh di cua tre*.