Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
vai cuu » vai cua
dua ban » cua ban, qua ban, mua ban
van cau » van dau, van hau, van chat
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi

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