Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
ca cua » co cua
va cua » va chua, via cua, ma cua
va cao » va cac, va co, va dao
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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