Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
va cham » va chat, va tham
tai cua » thai cua, tai cuc, tri cua
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
duc ban » duc tan, duc van, dua ban
va cam » va cac, va cao, va cai
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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)) ty nang ma hoi. hieu ((va cam) or (va cham)) duc ban thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang ma hoi. hieu ((va cam) OR (va cham)) duc ban thanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ty nang ma hoi. hieu ((va cam) or (va cham)) duc ban thanh tai cua te*.