Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
nang mai » nang ma, nang tai, lang mai
tu sach » thu sach, su sach, tu cach
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve chay » ve chat, de chay, ve cham
dua ban » dia ban, qua ban, mua ban
vai cua » dai cua, hai cua, lai cua
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 (te sach)) ky nang mai hoi. hieu ve chay ((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 mai hoi. hieu ve chay ((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 mai hoi. hieu ve chay ((dua ban) OR (cua ban)) thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang mai hoi. hieu ve chay ((dua ban) OR (cua ban)) thanh vai cua tre*.