Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
xuc van » duc van, luc van, vuc van
cuu tre » cau tren, cau treo
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
ho hoi » hoc hoi, hoa hoi, hoi hoi

You may be able to get more results by adjusting your search query.

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