Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
van hai » van ha, van chat, van phan
dan ban » van ban, can ban, dan ba
pho cua » cho cua, kho cua, tho cua
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: ((te sach) or (thu sach)) y nang x hoi. hieu ((van hai) OR (van hanh)) dan ban thanh pho cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) y nang x hoi. hieu ((van hai) OR (van hanh)) dan ban thanh pho cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) y nang x hoi. hieu ((van hai) OR (van hanh)) dan ban thanh pho cua viet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) y nang x hoi. hieu ((van hai) OR (van hanh)) dan ban thanh pho cua viet*.