Perhaps you should try some spelling variations:
thanh vai » thanh van, thanh tai, thanh oai
thanh hai » thanh phan, thanh hoa, thanh san
cua viet » ca viet, hoa viet, cua vat
duc ban » duc tan, duc van, dua ban
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
va cao » va cac, va co, va dao
va cam » va cham, va cac, va cai

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 ky nang xa hoi. lieu ((va cam) OR (va cao)) duc ban ((thanh vai) OR (thanh hai)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. lieu ((va cam) or (va cao)) duc ban ((thanh vai) OR (thanh hai)) cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. lieu ((va cam) or (va cao)) duc ban ((thanh vai) OR (thanh hai)) cua viet*.