Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, qua ban, mua ban
tu sach » thu sach, su sach, tu cach
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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