Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
duoc ban » duc ban, buoc ban, duoc bat
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
tu sach » su sach, te sach, tu cach
vai cua » dai cua, hai cua, lai cua
van lam » van nam
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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) OR (thu sach)) ky nang xa hoi. hieu van lam ((duoc ban) or (quoc ban)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. hieu van lam ((duoc ban) OR (quoc ban)) thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang xa hoi. hieu van lam ((duoc ban) or (quoc ban)) thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang xa hoi. hieu van lam ((duoc ban) or (quoc ban)) thanh vai cua tre*.