Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
tu sach » thu sach, te sach, tu cach
duc ban » duc tan, duc van, dua ban
cuc tre » duc tre, cua tre, cuu tre
cao hoc » co hoc, cho hoc, chat hoc
su sach » so sach, vu sach
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) OR (su sach)) ky nang cao hoc. hieu ((va cam) OR (va cao)) duc ban thanh tai cuc tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang cao hoc. hieu ((va cam) OR (va cao)) duc ban thanh tai cuc tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang cao hoc. hieu ((va cam) OR (va cao)) duc ban thanh tai cuc tre*.