Perhaps you should try some spelling variations:
quan thanh » ban thanh, van thanh
chay tren » thai tren, ca tren, cau tren
thanh lap » thanh san, phan lap, thanh hai
hoc quan » hoc dan, tac quan, hoc phan
chau tre » chau tho, cho tre, cau tra
van chat » cao chat
van cam » van nam, van lam, van cau
tu sach » thu sach, su sach, te sach
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 cam) or (van chat)) hoc quan thanh lap ((chau tre) OR (chay tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ((van cam) OR (van chat)) hoc quan thanh lap ((chau tre) OR (chay tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu ((van cam) or (van chat)) hoc quan thanh lap ((chau tre) OR (chay tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((van cam) or (van chat)) hoc quan thanh lap ((chau tre) OR (chay tren))*.