Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van chat » cao chat
quoc ban » quoc bao, quoc lan, quoc quan
lap chau » lai chau, ha chau, hat chau
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
y nang » ky nang, ly nang, v nang
a chau » ha chau, lai chau, hat chau
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)) quoc ban thanh ((lap chau) OR (a chau)) tre~.
• 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)) quoc ban thanh ((lap chau) OR (a chau)) tre.
• 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)) quoc ban thanh ((lap chau) OR (a chau)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((van cam) or (van chat)) quoc ban thanh ((lap chau) OR (a chau)) tre*.