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, khau sach
cham cuc » cham cuu, pham cuc, pham chuc
tu sach » su sach, te sach, tu cach
nang co » nang cao, nang doc, nang noi
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu 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) OR (thu hoach)))) ky nang co hoc. hieu vu 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) OR (thu hoach)))) ky nang co hoc. hieu vu cham cuc ban thanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((thu sach) OR (thu hoach)))) ky nang co hoc. hieu vu cham cuc ban thanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((thu sach) OR (thu hoach)))) ky nang co hoc. hieu vu cham cuc ban thanh tai cuc tre*.