Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
thu sach » thuat sach, thuoc sach, thu hoach
cham cuc » cham cuu, pham cuc, pham chuc
tu sach » su sach, te sach, tu cach
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cuc ban » cua ban, cac ban, cuu ban
cuc tre » duc tre, cua tre, cuu tre

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)) ky nang cao hoc. hieu ve cham cuc ban thanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang cao hoc. hieu ve cham cuc ban thanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang cao hoc. hieu ve cham cuc ban thanh tai cuc tre*.