Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
duc ban » duc tan, duc van, duc man
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang

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)) y nang xa hoi. hieu ve cac ((duc ban) or (dua ban)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu ve cac ((duc ban) OR (dua ban)) thanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang xa hoi. hieu ve cac ((duc ban) or (dua ban)) thanh vai cua tre*".